When, therefore, man lives according to man, not according to God, he is like the devil. Because not even an angel might live according to an angel, but only according to God, if he was to abide in the truth, and speak God's truth and not his own lie. And of man, too, the same apostle says in another place, "If the truth of God hath more abounded through my lie;"[15]--"my lie," he said, and "God's truth." When, then, a man lives according to the truth, he lives not according to himself, but according to God; for He was God who said, "I am the truth."[16] When, therefore, man lives according to himself,--that is, according to man, not according to God,--assuredly he lives according to a lie; not that man himself is a lie, for God is his author and creator, who is certainly not the author and creator of a lie, but because man was made upright, that he might not live according to himself, but according to Him that made him,--in other words, that he might do His will and not his own; and not to live as he was made to live, that is a lie. For he certainly desires to be blessed even by not living so that he may be blessed. And what is a lie if this desire be not? Wherefore it is not without meaning said that all sin is a lie. For no sin is committed save by that desire or will by which we desire that it be well with us, and shrink from it being ill with us. That, therefore, is a lie which we do in order that it may be well with us, but which makes us more miserable than we were. And why is this, but because the source of man's happiness lies only in God, whom he abandons when he sins, and not in himself, by living according to whom he sins?