They are not human motives that form and fashion and produce the morality of a Christian, any more than it is human power that accomplishes his salvation. It is "the grace of God" that teaches him as well as saves him.
This is very remarkably shown in a passage in Timothy (1 Tim. 3:1616And without controversy great is the mystery of godliness: God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory. (1 Timothy 3:16)), the force of which is very frequently overlooked. The Apostle would teach Timothy how he ought to behave himself "in the house of God"; and he then presents the formative power of all true godliness in the words, "And confessedly the mystery of piety is great. God has been manifested in flesh, has been justified in [the] Spirit, has appeared to angels, has been preached among [the] nations, has been believed on in [the] world, has been received up in glory." J.N.D. Trans.
This is often quoted and interpreted as if it spoke of the mystery of the Godhead, or the mystery of Christ's Person. But it is the mystery of godliness, or the secret by which all real godliness is produced-the divine spring of all that can be called piety in man. "God... manifest in the flesh" is the example and the power of godliness, its measure and its spring. Godliness is not now produced, as under the law, by divine enactments; nor is it the result in the spirit of bondage in those (however godly) who only know God as worshipped behind a veil. Godliness now springs from the knowledge of the incarnation, death, resurrection and ascension of the Lord Jesus Christ. It takes its spring and character from the knowledge of His Person as "God... manifest in the flesh"; the perfectness of His obedience as "justified in the Spirit"; the Object of angelic contemplation, and the subject of testimony and faith in the world; and His present position as "received up into glory."
This is how God is known; and from abiding in this flows godliness. The object of faith is the power of life.