What is the scriptural evidence that faith comes from God?

I've heard both of these claims, and they seem to have irreconcilable differences: - God does his part (the call/invitation), now you do yours (respond in faith) - God not only gave his son for you, but he will give you the faith to believe it. I'm less interested here in the broader question of the doctrine of election; I'm focusing specifically on the second bullet point: is there scriptural evidence that faith is a gift or something that we receive from God?