How do we know God is the one who enables repentance?

In Romans 2:4, it is declared that it is the goodness of God that leads people to repentance, highlighting that repentance itself is a divine gift rather than a mere human initiative. Likewise, Jeremiah 31:18 illustrates Ephraim's understanding that it is God who must turn him to repentance. This perspective reinforces the Reformed belief that any movement toward God originates from God's sovereign work in a person's heart, thus removing any grounds for self-glorification in the act of repentance.