Where does faith comes from? God is the originator. He, God the Holy Spirit, produces faith in us, after He has changed our heart from rock to flesh. Ephesians, chapter 2:

8For(Q) by grace you have been saved(R) through faith. And this is(S) not your own doing;(T) it is the gift of God, 9(U) not a result of works,(V) so that no one may boast.

We could debate that the word “this” is being applied to salvation only. But I think Apostle Paul has the whole process in mind: it starts because God is full of grace, the result is our salvation, and the instrument is faith. The whole package is a gift from God, not a result of anything we have done. Kind of remove a lot of pressure off our shoulders, doesn’t it?