How does the believer tap into his source of power? To be strong in the Lord’s might requires two acts of faith. First you must have a settled, firm persuasion that the Lord is almighty in power. This is a foundational truth. Secondly you must not only believe that God is almighty, but also that this almighty power of God is engaged for your defense. God expects you to meet every trial, every temptation, leaning on His arm.
From the book "The Christian In Complete Armour"