There must be no other motive for action than the will of God, which, for men, is ALWAYS to be found in the Word of God, because when Satan tempts us to act, as he always does, by some other motive, this motive is seen to be opposed to God's Word, which is in the heart and is therefore judged as being opposed to it. This is the reason why it is so often important, when we are in doubt, to ask ourselves by what motive we are influenced.