John 6:37-40 [CSB]
"Everyone the Father gives me will come to me, and the one who comes to me I will never 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 I should lose none of those he has given me but should raise them up on the last day. For this is the will of my Father: that everyone who sees the Son and believes in him will have eternal life, and I will raise him up on the last day."
So you are saying that NOT EVERYONE “who sees the Son and believes in him” will have eternal life, but only those that STRIVE HARD ENOUGH? Jesus should probably have mentioned that rather than mislead all those people with his false promises in John 6.
Jesus says: "Truly I tell you, anyone who believes has eternal life.” [John 6:47]
kcnalp adds: “... if they STRIVE to stay saved.”
I know whose testimony I WILL BELIEVE!
As for Luke 13 ... context, context, context:
Luke 13:22-30 [NKJV]
And He went through the cities and villages, teaching, and journeying toward Jerusalem. Then one said to Him, "Lord, are there few who are saved?" And He said to them, "Strive to enter through the narrow gate, for many, I say to you, will seek to enter and will not be able. When once the Master of the house has risen up and shut the door, and you begin to stand outside and knock at the door, saying, 'Lord, Lord, open for us,' and He will answer and say to you, 'I do not know you, where you are from,' then you will begin to say, 'We ate and drank in Your presence, and You taught in our streets.' But He will say, 'I tell you I do not know you, where you are from. Depart from Me, all you workers of iniquity.' There will be weeping and gnashing of teeth, when you see Abraham and Isaac and Jacob and all the prophets in the kingdom of God, and yourselves thrust out. They will come from the east and the west, from the north and the south, and sit down in the kingdom of God. And indeed there are last who will be first, and there are first who will be last."