The Word of God creates what it commands. When Christ says to any of us "Now are ye clean through the word which I have spoken unto you," We are clean. When He says "no condemnation" there is none, though there has been a lifetime of sin before. And when He says, "mighty through God to the pulling down of strongholds," then the weak are strong. This is the part of faith, to take God at His Word, and then expect Him to make it real. A French commander thanked a common soldier who had saved his life and called him captain, although he was but a private, but the man took the commander at his word, accepted the new name and was thereby constituted indeed a captain.
Shall we thus take God's creating word of justification, sanctification, power and deliverance and thus make real the mighty promise, "He giveth power to the faint, and to them that have no might He increaseth strength; for they that wait on the Lord shall renew their strength."