Jesus said to them, “I am the bread of life; he who comes to Me will not hunger, and he who believes in Me will never thirst. But I said to you that you have seen Me, and yet do not believe. All that the Father gives Me will come to Me, and the one who comes to Me I will certainly not cast out. For I have come down from heaven, not to do My own will, but the will of Him who sent Me. This is the will of Him who sent Me, that of all that He has given Me I lose nothing, but raise it up on the last day. For this is the will of My Father, that everyone who beholds the Son and believes in Him will have eternal life, and I Myself will raise him up on the last day.” No one can come to Me unless the Father who sent Me draws him; and I will raise him up on the last day. It is written in the prophets, ‘A nd they shall all be taught of G od .’ Everyone who has heard and learned from the Father, comes to Me. Not that anyone has seen the Father, except the One who is from God; He has seen the Father. Truly, truly, I say to you, he who believes has eternal life.
JOHN 6:35-40, 44-47 NASB
https://bible.com/bible/100/jhn.6.35-47.NASB
If you believe scripture, and that these are the accurate words of Christ Jesus, it is impossible for a man to come to Jesus, and believe in him and be turned away. Because all that come to him come by the drawing of the Father who sent him, and he by his own words will not turn them away.
I do not share this to be harsh. What do you suppose this parable means? For it states that many are called, but few are chosen.
"Then saith he to his servants, The wedding is ready, but they which were bidden were not worthy.
Go ye therefore into the highways, and as many as ye shall find, bid to the marriage.
So those servants went out into the highways, and gathered together all as many as they found, both bad and good: and the wedding was furnished with guests.
And when the king came in to see the guests, he saw there a man which had not on a wedding garment:
And he saith unto him, Friend, how camest thou in hither not having a wedding garment? And he was speechless.
Then said the king to the servants, Bind him hand and foot, and take him away, and cast him into outer darkness; there shall be weeping and gnashing of teeth.
For many are called, but few are chosen." Matt 22:8-14
Jesus told people to strive to enter in at the strait (narrow) gate:
hen said one unto him, Lord, are there few that be saved? And he said unto them,
Strive to enter in at the strait gate: for many, I say unto you, will seek to enter in, and shall not be able." Luke 13:23-24
And that, "...wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it. Matt 7:13-14
It is our duty to search out and obey Jesus' commands.