Because some have faith, and some want nothing to do with it.
Does that mean God has not worked on them, shared his word to them, and used you or others to expose them to the light so they can see?
No.
Again, this is a typical Calvinist response, which is nonsense, I know people who are smarter than me, In fact, a jewish pharisee could quote the OT verbatim, does that mean he should have been saved, and not me?
how smart a person does not make a person savable. His heart is what has to be changed, and only God can work though himself and others and circumstances of life to bring that person to faith, Again, People respond differently, whaty may work for you may not work for me, God knows. because he knows us.
Calvin swung and missed, He was so fearful of taking any credit for himself. he reacted that thought that even our free will decision to say yest to God was a work, sadly, he brought alot of people with him.
what is the answer? Jesus gave us the answer
the proud pharisee praised God he was not like the tax collector. he was smarter, loved God, had less sin, even after jesus exposed his sin,
the tax collector. He took what God showed him, and sought after God, which God said whoever does, he will show them his truth, and came to the point he was broken, because like paul he considered any good deeds or things he had as useless.. showing he truly repented.
Who did Jesus say went home saved? the smart righteous pharisee who refused to acknowledge how broken he was, ? or the humble broken sinner?