When God contemplates some great work, He begins it by the hand of some poor, weak, human creature, to whom He afterwards gives aid.
For that purpose Christ instituted holy baptism, thereby to clothe you with his righteousness. It is tantamount to his saying, My righteousness shall be your righteousness; my innocence, your innocence. Your sins indeed are great, but by baptism I bestow on you my righteousness; I strip death from you and clothe you with my life.
The confidence and faith of the heart alone make both God and an idol. If your faith and trust be right, then is your god also true; and, on the other hand, if your trust be false and wrong, then you have not the true God; for these two belong together faith and God. That now, I say, upon which you set your heart and put your trust is properly your god.