our members as instruments of unrighteousness,[147] then the soul is converted from its own evil and selfish desires, and, God possessing it, it possesses itself in peace even in this life, and afterwards, with perfected health and endowed with immortality, will reign without sin in peace everlasting. 7. _Of the cause of Cain's crime and his obstinacy, which not even the word of God could subdue._ But though God made use of this very mode of address which we have been endeavouring to explain, and spoke to Cain in that form by which He was wont to accommodate Himself to our first parents and converse with them as a companion, what good influence had it on Cain? Did he not fulfil his wicked intention of killing his brother even after he was warned by God's voice? For when God had made a distinction between their sacrifices, neglecting Cain's, regarding Abel's, which was doubtless intimated by some visible sign to that effect; and when God had done so because the works of the one were evil but those of his brother good, Cain was very wroth, and his countenance fell. For thus it is written: "And the Lord said unto Cain, Why art thou wroth, and why is thy countenance fallen? If thou offerest rightly, but dost not rightly distinguish, hast thou not sinned? Fret not thyself, for unto thee shall be his turning, and thou shalt rule over him."[148] In this admonition administered by God to Cain, that clause indeed, "If thou offerest rightly, but dost not rightly distinguish, hast thou not sinned?" is obscure, inasmuch as it is not apparent for what reason or purpose it was spoken, and many meanings have been put upon it, as each one who discusses it attempts to interpret it according to the rule of faith. The truth is, that a sacrifice is "rightly offered" when it is offered to the true God, to whom alone we must sacrifice. And it is "not rightly distinguished" when we do not rightly distinguish the places or seasons or materials of the offering, or the person offering, or the person to whom it is presented, or those to whom it is distributed for food after the oblation. Distinguishing[149] is here used for discriminating,--whether when an offering is made in a place where it ought not or of a material which ought to be offered not there but elsewhere; or when an offering is made at a wrong time, or of a material suitable not then but at some other time; or when that is offered which in no place nor any time ought to be offered; or when a man keeps to himself choicer specimens of the same kind than he offers to God; or when he or any other who may not lawfully partake profanely eats of the oblation. In which of these particulars Cain displeased God, it is difficult to determine. But the Apostle John, speaking of these brothers, says, "Not as Cain, who was of that wicked one, and slew his brother. And wherefore slew he him? Because his own works were evil, and his brother's righteous."[150] He