In John 6:44, NIV. No-one can come to me unless the Father who sent me draws him, and I will raise him up at the last day. So God draws the person to Christ to be saved.
Jesus in John 6:43-59 taught the importance of remaining in him; a figure of speech eat his flesh and drink his blood to have life otherwise cannot have eternal life vs 58. He disclosed that hecis the bread from heaven.
John 6:43-58
[43]Jesus answered, “Stop grumbling among yourselves.
[44]No one can come to me unless the Father who sent me draws him to me; and I will raise him to life on the last day.
[45]The prophets wrote, ‘Everyone will be taught by God.’ Anyone who hears the Father and learns from him comes to me.
[46]This does not mean that anyone has seen the Father; he who is from God is the only one who has seen the Father.
[47]I am telling you the truth: he who believes has eternal life.
[48]I am the bread of life.
[49]Your ancestors ate manna in the desert, but they died.
[50]But the bread that comes down from heaven is of such a kind that whoever eats it will not die.
[51]I am the living bread that came down from heaven. If anyone eats this bread, he will live for ever. The bread that I will give him is my flesh, which I give so that the world may live.”
[52]This started an angry argument among them. “How can this man give us his flesh to eat?” they asked.
[53]Jesus said to them, “I am telling you the truth: if you do not eat the flesh of the Son of Man and drink his blood, you will not have life in yourselves.
[54]Those who eat my flesh and drink my blood have eternal life, and I will raise them to life on the last day.
[55]For my flesh is the real food; my blood is the real drink.
[56]Those who eat my flesh and drink my blood live in me, and I live in them.
[57]The living Father sent me, and because of him I live also. In the same way whoever eats me will live because of me.
[58]This, then, is the bread that came down from heaven; it is not like the bread that your ancestors ate. They later died, but those who eat this bread will live for ever.”