YOU believed.
NOt God the Father, not Jesus......YOU believed.
But for some reason it's not a work of self righteousness when you do it, but it is when a not once saved always saved person does it.
He worked it in you, but YOU did the believing. YOU did it. He made it possible for YOU to do that.
Yes, listen to what you're saying........"MY faith" (I know you mean 'believing'). YOUR believing is based on the trustworthiness of God.
That's kind of a given.......if faith (believing) fails it is no longer faith.
It is quite possible to reject God's gift of faith and stop believing. The Galatians, the Corinthians, and the Hebrew churches did. Paul jumped through hoops to bring them back. The serpent is always looking for ways to get us to abandon our belief and trust in the forgiveness of Christ.
My believing is mine. The faith to do that believing is from God. That's why I can not boast. That hardly negates the fact that I do the believing. God makes it possible for ME to do the believing that is required to be saved and stay saved-1 Corinthians 15:2.