God energizes faith...

...man exercises faith.

We know that faith comes from hearing and hearing by the word of God. (Romans 10:17) God begins the good work of conforming us to the image of His Son with an encounter with His word and He says He will perfect it until the day of Christ. (Philippians 1:6)

From Romans 8:30 we learn that in the plan and mind of God this good work, this conforming us to the image of His Son, is already accomplished. "And these whom He predestined, He also called; and these whom He called, He also justified; and these whom He justified, He also glorified."

Faith that is genuinely a work of God therefore is enduring faith and will not fail.