No individual Christian is an infallible interpreter of Scripture, nor can he consistently & reliably come up with the truth without a teacher, as ordained by Christ(Eph. 4:11). A good use of commentaries is to look at the comments and arguments made from the various theological perspectives. For example on a hotly debated point -
Acts 13:48
KJV/ASV/RSV: 'were ordained'; NRSV: 'had been destined'; ESV 'were appointed'; REB 'were marked out' (That is representative in translations of the hotly debated word in the verse.)
Thayer's Greek-English Lexicon of NT Greek
"ὅσοι ἦσαν τεταγμένοι εἰς ζωήν αἰώνιον, as many as were appointed (A.V. ordained) (by God) to obtain eternal life, or to whom God had decreed eternal life, Act 13:48"
John Gill - Baptist
and as many as were ordained unto eternal life believed; faith is not the cause, or condition of the decree of eternal life, but a means fixed in it, and is a fruit and effect of it, and what certainly follows upon it, as in these persons: some would have the words rendered, "as many as were disposed unto eternal life believed"; which is not countenanced by the ancient versions. The Arabic renders it as we do, and the Syriac thus, "as many as were put, or appointed unto eternal life"; and the Vulgate Latin version, "as many as were pre-ordained". Moreover, the phrase of being "disposed unto", or "for eternal life", is a very unusual, if not a very improper, and an inaccurate one; men are said to be disposed to an habit, or to an act, as to vice or virtue, but not to reward or punishment, as to heaven or hell; nor does it appear that these Gentiles had any good dispositions to eternal life, antecedent to their believing; for though they are said, Ac 13:42 to entreat the apostles to preach the same things to them the next sabbath, yet the words as there observed, according to their natural order, may be rendered "they", i.e. the apostles, "besought the Gentiles"; and in some copies and versions, the "Gentiles" are not mentioned at all: and as for their being "glad", and "glorifying the word of the Lord", it is not evident that this was before their believing; and if it was, such things have been found in persons, who have had no true, real, and inward dispositions to spiritual things, as in many of our Lord's hearers; besides, admitting that there are, in some, good dispositions to eternal life, previous to faith, and that desiring eternal life, and seeking after it, be accounted such, yet these may be where faith does not follow; as in the young rich ruler, that came to Christ with such an inquiry, and went away sorrowful: as many therefore as are so disposed, do not always believe, faith does not always follow such dispositions; and after all, one would have thought that the Jews themselves, who were externally religious, and were looking for the Messiah, and especially the devout and able women, were more disposed unto eternal life, than the ignorant and idolatrous Gentiles; and yet the latter believed, and the former did not: it follows then, that their faith did not arise from previous dispositions to eternal life, but was the fruit and effect of divine ordination unto it; and the word here used, in various places in this book, signifies determination and appointment, and not disposition of mind; see Ac 15:2 The phrase is the same with that used by the Jews, דאתקנו לחיי עולם, "who are ordained to eternal life" {y}; and עלמא כל דכתיב לחיי, "everyone that is written to eternal life"; {z} i.e. in the book of life; and designs no other than predestination or election, which is God's act, and is an eternal one; is sovereign, irrespective, and unconditional; relates to particular persons, and is sure and certain in its effect: it is an ordination, not to an office, nor to the means of grace, but to grace and glory itself; to a life of grace which is eternal, and to a life of glory which is for ever; and which is a pure gift of God, is in the hands of Christ, and to which his righteousness gives a title: and ordination to it shows it to be a blessing of an early date; and the great love of God to the persons ordained to it; and the certainty of enjoying it."
Paul Kretzmann - Lutheran
"So they praised the Word of the Lord, through which they were assured of acceptance into the kingdom of God directly, without the intermediate process of joining the Jewish synagogue. And they believed, not all, but as many as were ordained or appointed unto eternal life by God, not in consequence of an absolute decree. but in Christ Jesus, through the redemption in His blood, Eph_1:4-5. Their belief was the result of this gracious determination and foreknowledge, predestination, of God, which is spoken of at length in other passages of Scriptures, Eph_1:3-6; Rom_8:28-30, And this fact is a source of great comfort. The faith of a Christian and his preservation in this faith is not a matter which depends upon his own reason and strength, a precarious basis at best, but upon the grace of God in Christ Jesus, assured to him before the foundation of the world. "The eternal election of God not only sees and knows in advance the salvation of the elect, but also by the gracious and good will of God in Christ Jesus is a reason which effects, procures, helps, and promotes our salvation, and what pertains thereto; whereon also our salvation is so firmly founded that the portals of hell cannot prevail against it, as is written: ’As many as were ordained to eternal life believed.'"
Jamieson-Fausset-Brown - Reformed & Presbyterian
"and as many as were ordained to eternal life believed — a very remarkable statement, which cannot, without force, be interpreted of anything lower than this, that a divine ordination to eternal life is the cause, not the effect, of any man’s believing."
Adam Clarke - Methodist
"As many as were ordained to eternal life believed.] This text has been most pitifully misunderstood. Many suppose that it simply means that those in that assembly who were fore-ordained; or predestinated by God's decree, to eternal life, believed under the influence of that decree. Now, we should be careful to examine what a word means, before we attempt to fix its meaning. Whatever τεταγμενοι may mean, which is the word we translate ordained, it is neither προτεταγμενοι nor προορισμενοι which the apostle uses, but simply τεταγμενοι, which includes no idea of pre-ordination or pre-destination of any kind. And if it even did, it would be rather hazardous to say that all those who believed at this time were such as actually persevered unto the end, and were saved unto eternal life. But, leaving all these precarious matters, what does the word τεταγμενος mean? The verb ταττω or τασσω signifies to place, set, order, appoint, dispose; hence it has been considered here as implying the disposition or readiness of mind of several persons in the congregation, such as the religious proselytes mentioned Ac 13:43, who possessed the reverse of the disposition of those Jews who spake against those things, contradicting and blaspheming, Ac 13:45. Though the word in this place has been variously translated, yet, of all the meanings ever put on it, none agrees worse with its nature and known signification than that which represents it as intending those who were predestinated to eternal life: this is no meaning of the term, and should never be applied to it. Let us, without prejudice, consider the scope of the place: the Jews contradicted and blasphemed; the religious proselytes heard attentively, and received the word of life: the one party were utterly indisposed, through their own stubbornness, to receive the Gospel; the others, destitute of prejudice and prepossession, were glad to hear that, in the order of God, the Gentiles were included in the covenant of salvation through Christ Jesus; they, therefore, in this good state and order of mind, believed."
Acts 13:48
KJV/ASV/RSV: 'were ordained'; NRSV: 'had been destined'; ESV 'were appointed'; REB 'were marked out' (That is representative in translations of the hotly debated word in the verse.)
Thayer's Greek-English Lexicon of NT Greek
"ὅσοι ἦσαν τεταγμένοι εἰς ζωήν αἰώνιον, as many as were appointed (A.V. ordained) (by God) to obtain eternal life, or to whom God had decreed eternal life, Act 13:48"
John Gill - Baptist
and as many as were ordained unto eternal life believed; faith is not the cause, or condition of the decree of eternal life, but a means fixed in it, and is a fruit and effect of it, and what certainly follows upon it, as in these persons: some would have the words rendered, "as many as were disposed unto eternal life believed"; which is not countenanced by the ancient versions. The Arabic renders it as we do, and the Syriac thus, "as many as were put, or appointed unto eternal life"; and the Vulgate Latin version, "as many as were pre-ordained". Moreover, the phrase of being "disposed unto", or "for eternal life", is a very unusual, if not a very improper, and an inaccurate one; men are said to be disposed to an habit, or to an act, as to vice or virtue, but not to reward or punishment, as to heaven or hell; nor does it appear that these Gentiles had any good dispositions to eternal life, antecedent to their believing; for though they are said, Ac 13:42 to entreat the apostles to preach the same things to them the next sabbath, yet the words as there observed, according to their natural order, may be rendered "they", i.e. the apostles, "besought the Gentiles"; and in some copies and versions, the "Gentiles" are not mentioned at all: and as for their being "glad", and "glorifying the word of the Lord", it is not evident that this was before their believing; and if it was, such things have been found in persons, who have had no true, real, and inward dispositions to spiritual things, as in many of our Lord's hearers; besides, admitting that there are, in some, good dispositions to eternal life, previous to faith, and that desiring eternal life, and seeking after it, be accounted such, yet these may be where faith does not follow; as in the young rich ruler, that came to Christ with such an inquiry, and went away sorrowful: as many therefore as are so disposed, do not always believe, faith does not always follow such dispositions; and after all, one would have thought that the Jews themselves, who were externally religious, and were looking for the Messiah, and especially the devout and able women, were more disposed unto eternal life, than the ignorant and idolatrous Gentiles; and yet the latter believed, and the former did not: it follows then, that their faith did not arise from previous dispositions to eternal life, but was the fruit and effect of divine ordination unto it; and the word here used, in various places in this book, signifies determination and appointment, and not disposition of mind; see Ac 15:2 The phrase is the same with that used by the Jews, דאתקנו לחיי עולם, "who are ordained to eternal life" {y}; and עלמא כל דכתיב לחיי, "everyone that is written to eternal life"; {z} i.e. in the book of life; and designs no other than predestination or election, which is God's act, and is an eternal one; is sovereign, irrespective, and unconditional; relates to particular persons, and is sure and certain in its effect: it is an ordination, not to an office, nor to the means of grace, but to grace and glory itself; to a life of grace which is eternal, and to a life of glory which is for ever; and which is a pure gift of God, is in the hands of Christ, and to which his righteousness gives a title: and ordination to it shows it to be a blessing of an early date; and the great love of God to the persons ordained to it; and the certainty of enjoying it."
Paul Kretzmann - Lutheran
"So they praised the Word of the Lord, through which they were assured of acceptance into the kingdom of God directly, without the intermediate process of joining the Jewish synagogue. And they believed, not all, but as many as were ordained or appointed unto eternal life by God, not in consequence of an absolute decree. but in Christ Jesus, through the redemption in His blood, Eph_1:4-5. Their belief was the result of this gracious determination and foreknowledge, predestination, of God, which is spoken of at length in other passages of Scriptures, Eph_1:3-6; Rom_8:28-30, And this fact is a source of great comfort. The faith of a Christian and his preservation in this faith is not a matter which depends upon his own reason and strength, a precarious basis at best, but upon the grace of God in Christ Jesus, assured to him before the foundation of the world. "The eternal election of God not only sees and knows in advance the salvation of the elect, but also by the gracious and good will of God in Christ Jesus is a reason which effects, procures, helps, and promotes our salvation, and what pertains thereto; whereon also our salvation is so firmly founded that the portals of hell cannot prevail against it, as is written: ’As many as were ordained to eternal life believed.'"
Jamieson-Fausset-Brown - Reformed & Presbyterian
"and as many as were ordained to eternal life believed — a very remarkable statement, which cannot, without force, be interpreted of anything lower than this, that a divine ordination to eternal life is the cause, not the effect, of any man’s believing."
Adam Clarke - Methodist
"As many as were ordained to eternal life believed.] This text has been most pitifully misunderstood. Many suppose that it simply means that those in that assembly who were fore-ordained; or predestinated by God's decree, to eternal life, believed under the influence of that decree. Now, we should be careful to examine what a word means, before we attempt to fix its meaning. Whatever τεταγμενοι may mean, which is the word we translate ordained, it is neither προτεταγμενοι nor προορισμενοι which the apostle uses, but simply τεταγμενοι, which includes no idea of pre-ordination or pre-destination of any kind. And if it even did, it would be rather hazardous to say that all those who believed at this time were such as actually persevered unto the end, and were saved unto eternal life. But, leaving all these precarious matters, what does the word τεταγμενος mean? The verb ταττω or τασσω signifies to place, set, order, appoint, dispose; hence it has been considered here as implying the disposition or readiness of mind of several persons in the congregation, such as the religious proselytes mentioned Ac 13:43, who possessed the reverse of the disposition of those Jews who spake against those things, contradicting and blaspheming, Ac 13:45. Though the word in this place has been variously translated, yet, of all the meanings ever put on it, none agrees worse with its nature and known signification than that which represents it as intending those who were predestinated to eternal life: this is no meaning of the term, and should never be applied to it. Let us, without prejudice, consider the scope of the place: the Jews contradicted and blasphemed; the religious proselytes heard attentively, and received the word of life: the one party were utterly indisposed, through their own stubbornness, to receive the Gospel; the others, destitute of prejudice and prepossession, were glad to hear that, in the order of God, the Gentiles were included in the covenant of salvation through Christ Jesus; they, therefore, in this good state and order of mind, believed."