John 6:44
“No man can come unto Me, except the Father which has sent Me draw Him.”
The Manichæans spring upon these words, saying, “that nothing lies in our own power”; yet the expression shows that we are masters of our will. “For if a man comes to Him,” says some one, “what need is there of drawing?” But the words do not take away our free will, but show that we greatly need assistance. And He implies not an unwilling comer, but one enjoying much succor. Then He shows also the manner in which He draws; for that men may not, again, form any material idea of God, He adds,
Source: Homilies on the Gospel of John (New Advent)