How do we know that God chooses people for greatness?

In Luke 1:15, we see that John the Baptist was chosen by God even before he was born, filled with the Holy Spirit from the womb. This illustrates the doctrine of election and God's sovereignty in salvation. Romans 8:29 reinforces this, stating that God foreknew and predestined individuals to be conformed to the image of His Son. Thus, true greatness is not based on human effort but on God's grace and purpose established from eternity. God’s choice does not depend on our works but His divine will.