John 6:44 No man can come to me, except the Father which hath sent me draw him: and I will raise him up at the last day. 45 It is written in the prophets, And they shall be all taught of God. Every man therefore that hath heard, and hath learned of the Father, cometh unto me. 46 Not that any man hath seen the Father, save he which is of God, he hath seen the Father. 47 Verily, verily, I say unto you, He that believeth on me hath everlasting life.
In the beginning was the oral words of God spoken unto the prophets who were called of God and taught others as by the words of God He drew men unto him, but not everyone chose to listen to His calling. It's the same with Jesus as He spoke nothing that God did not give Him to speak orally, John 12:49-50.
Many are called, but few are chosen as they try to climb up another way by their own righteousness, that is only a filthy rag to God as they never enter by the door that is Christ Jesus, Matthew 22:14; John 10:1-5; 10:9-16.
Who God calls out from among His own that have come to God's salvation through Christ are apostles; and some, prophets; and some, evangelists; and some, pastors and teachers, Ephesians 4:10-16.
Those who do not know Christ are those who reject Him for if they knew Him that would also know the Father who sent Him and will have eternal life, but those who reject Christ will the wrath of God fall on them, John 3:36.
Romans 10:12 For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him. 13 For whosoever shall call upon the name of the Lord shall be saved. 14 How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? 15 And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things! 16 But they have not all obeyed the gospel. For Esaias saith, Lord, who hath believed our report? 17 So then faith cometh by hearing, and hearing by the word of God.