The only real responsibility of "believers " is to believe the Lord and Jesus qualified this in equating belief to obedience to His teaching. However, Jesus was preaching primarily to Jews under the law, not to the Gentiles. Most of the teaching relevant to the Church comes to us from Paul and is not really different in respect to the doctrines of grace, but assumes that our nature has been altered by His presence within us, and our deliverance from the bondage of sin manifested by the law. The law incites sin within our old nature, the nature according to the flesh, but His Spirit administers grace.
7 What shall we say then? Is the law sin? Certainly not! On the contrary, I would not have known sin except through the law. For I would not have known covetousness unless the law had said, “You shall not covet.” 8 But sin, taking opportunity by the commandment, produced in me all manner of evil desire. For apart from the law sin was dead. 9 I was alive once without the law, but when the commandment came, sin revived and I died. 10 And the commandment, which was to bring life, I found to bring death. 11 For sin, taking occasion by the commandment, deceived me, and by it killed me. Romans 7:7-11
