It is God's choice to regenerate sinners who otherwise would not believe. It is God's choice to save the elect.
15 Now if you are unwilling to serve the Lord, choose this day whom you will serve, whether the gods your ancestors served in the region beyond the River or the gods of the Amorites in whose land you are living, but as for me and my household, we will serve the Lord.”
5 Is such the fast that I choose,
a day to humble oneself?
Is it to bow down the head like a bulrush
and to lie in sackcloth and ashes?
Will you call this a fast,
a day acceptable to the Lord?
37 “Jerusalem, Jerusalem, the city that kills the prophets and stones those who are sent to it! How often have I desired to gather your children together as a hen gathers her brood under her wings, and you were not willing!