John 6:44 “No one can come to Me unless the Father who sent Me draws him; and I will raise him up on the last day.
ESV Study note - No one can come to me means “no one is able to come to me” (Gk. dynamai means “to be able”). This implies that no human being in the world, on his own, has the moral and spiritual ability to come to Christ unless God the Father draws him, that is, gives him the desire and inclination to come and the ability to place trust in Christ (see notes on Jn 6:37; 12:32).
John MacArthur - the Bible indicates that fallen man is unable, of his own volition, to come to Jesus Christ. Unregenerate people are dead in sin (Eph. 2:1; Col. 2:13), slaves to unrighteousness (John 8:34; Rom. 6:6, 17, 20), alienated from God (Col. 1:21), and hostile to Him (Rom. 5:10; 8:7). They are spiritually blind (2 Cor. 4:4) captives (2 Tim. 2:26) trapped in Satan’s kingdom (Col. 1:13), powerless to change their sinful natures (Jer. 13:23; Rom. 5:6), unable to please God (Rom. 8:8), and incapable of understanding spiritual truth (1 Cor. 2:14; cf. John 14:17). Although the human will is involved in coming to Christ (since no one is saved apart from believing the gospel—Mark 1:15; Acts 15:7; Rom. 1:16; 10:9–15; Eph. 1:13), sinners cannot come to Him of their own free will. (Moreover, a comparison of verse 44 with verse 37 shows that God’s drawing cannot apply to all unregenerate people, as proponents of prevenient grace argue, because verse 37 limits it to the redeemed whom God has given to Christ.) God irresistibly, efficaciously draws to Christ only those whom He chose for salvation in eternity past (Eph. 1:4–5, 11).
Martin Luther - Luther has put these words into classical form: “I believe that I cannot by my own reason or strength believe in Jesus Christ, my Lord, or come to him; but the Holy Ghost has called me by the gospel, … and will at the last day raise up me and all the dead, and give unto me and all believers in Christ eternal life. This is most certainly true.”
Spurgeon - “No man can come to me, except the Father which hath sent me draw him.” John 6:44
When man fell in the garden, manhood fell entirely; there was not one single pillar in the temple of manhood that stood erect. It is true, conscience was not destroyed. The pillar was not shattered; it fell, and it fell in one piece, and there it lies along, the mightiest remnant of God’s once perfect work in man. But that conscience is fallen, I am sure. Look at men. Who among them is the possessor of a “good conscience towards God,” but the regenerated man? Do you imagine that if men’s consciences always spoke loudly and clearly to them, they would live in the daily commission of acts, which are as opposed to the right as darkness is to light? No, beloved; conscience can tell me that I am a sinner, but conscience cannot make me feel that I am one. Conscience may tell me that such and such a thing is wrong, but how wrong it is conscience itself does not know. Did any man’s conscience, unenlightened by the Spirit, ever tell him that his sins deserved damnation? Or if conscience did do that, did it ever lead any man to feel an abhorrence of sin as sin? In fact, did conscience ever bring a man to such a self-renunciation, that he did totally abhor himself and all his works and come to Christ? No, conscience, although it is not dead, is ruined, its power is impaired, it has not that clearness of eye and that strength of hand, and that thunder of voice, which it had before the fall; but has ceased to a great degree, to exert its supremacy in the town of Mansoul. Then, beloved, it becomes necessary for this very reason, because conscience is depraved, that the Holy Spirit should step in, to show us our need of a Saviour, and draw us to the Lord Jesus Christ.