Cornelious also recognized that God has visited them. It helped to have the angelic messenger! God made very certain what was about to happen was very important.
Acts 10
" Immediately therefore I sent to thee; and thou hast well done that thou art come. Now therefore are we all here present before God, to hear all things that are commanded thee of God."
Other thing is Cornelious was a devout man praying to God always and doing good works. God made sure the gospel was preached to Him and had priorly planned to save Him and his household.
So Cornelious was a good man of God and that must have also done a good work of God in those around him, which prepared all of them ahead of time to believe in Christ. There is this somewhat hidden process of preparation to salvation where God is at work beforehand in the lives of His foreknown to Him people of God. Just like it was said of John the Baptist
Malachi 4
4 “Remember the Law of Moses, My servant,
Which I commanded him in Horeb for all Israel,
With the statutes and judgments.
5 Behold, I will send you Elijah the prophet
Before the coming of the great and dreadful day of the Lord.
6 And he will turn
The hearts of the fathers to the children,
And the hearts of the children to their fathers,
Lest I come and strike the earth with a curse.”
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Matthew 11
7 As they departed, Jesus began to say to the multitudes concerning John: “What did you go out into the wilderness to see? A reed shaken by the wind? 8 But what did you go out to see? A man clothed in soft garments? Indeed, those who wear soft clothing are in kings’ houses. 9 But what did you go out to see? A prophet? Yes, I say to you, and more than a prophet. 10 For this is he of whom it is written:
‘Behold, I send My messenger before Your face,
Who will prepare Your way before You.’
11 “Assuredly, I say to you, among those born of women there has not risen one greater than John the Baptist; but he who is least in the kingdom of heaven is greater than he. 12 And from the days of John the Baptist until now the kingdom of heaven suffers violence, and the violent take it by force. 13 For all the prophets and the law prophesied until John. 14 And if you are willing to receive it, he is Elijah who is to come. 15 He who has ears to hear, let him hear!
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Matthew 3
1 In those days John the Baptist came, preaching in the wilderness of Judea 2 and saying, “Repent, for the kingdom of heaven has come near.” 3 This is he who was spoken of through the prophet Isaiah:
“A voice of one calling in the wilderness,
‘Prepare the way for the Lord,
make straight paths for him.’”[a]
4 John’s clothes were made of camel’s hair, and he had a leather belt around his waist. His food was locusts and wild honey. 5 People went out to him from Jerusalem and all Judea and the whole region of the Jordan. 6 Confessing their sins, they were baptized by him in the Jordan River.
7 But when he saw many of the Pharisees and Sadducees coming to where he was baptizing, he said to them: “You brood of vipers! Who warned you to flee from the coming wrath? 8 Produce fruit in keeping with repentance. 9 And do not think you can say to yourselves, ‘We have Abraham as our father.’ I tell you that out of these stones God can raise up children for Abraham. 10 The ax is already at the root of the trees, and every tree that does not produce good fruit will be cut down and thrown into the fire.
11 “I baptize you with[b] water for repentance. But after me comes one who is more powerful than I, whose sandals I am not worthy to carry. He will baptize you with[c] the Holy Spirit and fire. 12 His winnowing fork is in his hand, and he will clear his threshing floor, gathering his wheat into the barn and burning up the chaff with unquenchable fire.”
The Baptism of Jesus
13 Then Jesus came from Galilee to the Jordan to be baptized by John. 14 But John tried to deter him, saying, “I need to be baptized by you, and do you come to me?”15 Jesus replied, “Let it be so now; it is proper for us to do this to fulfill all righteousness.” Then John consented.
16 As soon as Jesus was baptized, he went up out of the water. At that moment heaven was opened, and he saw the Spirit of God descending like a dove and alighting on him. 17 And a voice from heaven said, “This is my Son, whom I love; with him I am well pleased.”
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