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In John chapter 7, Jesus made a famous claim: I AM the bread of Heaven.
When the Jews ( who had witnessed Him miraculously multiply 5 loaves bread and 2 fish to feed a multitude) objected, Jesus reacted to their unbelief by saying 'Those the Father gives me WILL come.'
This phrase is the best tidings for those in frontier missions: the Saviour rests not on persuasion of the gospel message or the eagerness of the audience, but on the ultimate power of God to bring them.
Therefore, its not 'they might come', or 'they probably will come' its that they WILL come.
Praise be to the God and The Father of our Lord Jesus Christ, who has blessed us in the heavenly realms with every spiritual blessing in Chhrist. For He CHOSE US before the creation of the world to be holy and blameless in his sight. (EPHESIANS 1:3,4)
Paul was a screwup even though he followed the "law" to a T. He was a serious murderer. He still had sin issues even after his conversion, but he kept his faith and kept striving to be a better servant even though he knew he couldn't achieve perfection.
It did not matter, he had been chosen beforehand. It wasn't his strength that kept him going, it was Christ in him.
“The Kingdom of Heaven can be illustrated by the story of a king who prepared a great wedding feast for his son. When the banquet was ready, he sent his servants to notify those who were invited. But they all refused to come! “So he sent other servants to tell them, ‘The feast has been prepared. The bulls and fattened cattle have been killed, and everything is ready. Come to the banquet!’ But the guests he had invited ignored them and went their own way, one to his farm, another to his business. Others seized his messengers and insulted them and killed them.
“The king was furious, and he sent out his army to destroy the murderers and burn their town. And he said to his servants, ‘The wedding feast is ready, and the guests I invited aren’t worthy of the honor. Now go out to the street corners and invite everyone you see.’ So the servants brought in everyone they could find, good and bad alike, and the banquet hall was filled with guests.
“But when the king came in to meet the guests, he noticed a man who wasn’t wearing the proper clothes for a wedding. ‘Friend,’ he asked, ‘how is it that you are here without wedding clothes?’ But the man had no reply. Then the king said to his aides, ‘Bind his hands and feet and throw him into the outer darkness, where there will be weeping and gnashing of teeth.’
“For many are called, but few are chosen.”
I think he knew beforehand who would rely on him in truth and who wouldn't, and I think he knew who best to redeem for the purposes of the kingdom.
Just my 2c.