The Apostle dwells upon God's interest in purity. He is the avenger of all offences against it; but vengeance is His strange work. He has called us with a calling utterly alien to it,--not based on uncleanness or contemplating it, like some of the religions in Corinth, where Paul wrote this letter; but having sanctification, purity in body and in spirit, for its very element. The idea of "calling" is one which has been much degraded and impoverished in modern times. By a man's calling we usually understand his trade, profession, or business, whatever it may be; but our calling in Scripture is something quite different from this. It is our life considered, not as filling a certain place in the economy of society, but as satisfying a certain purpose in the mind and will of God. It is a calling _in Christ Jesus_; apart from Him it could not have existed. The Incarnation of the Son of God; His holy life upon the earth; His victory over all our temptations; His consecration of our weak flesh to God; His sanctification, by His own sinless experience, of our childhood, youth, and manhood, with all their unconsciousness, their bold anticipations, their sense of power, their bent to lawlessness and pride; His agony and His death upon the Cross; His glorious resurrection and ascension,--all these were necessary before we could be called with a Christian calling. Can any one imagine that the vices of heathenism, lust or covetousness, are compatible with a calling like this? Are they not excluded by the very idea of it? It would repay us, I think, to lift that noble word "calling" from the base uses to which it has descended; and to give it in our minds the place it has in the New Testament. It is God who has called us, and He has called us in Christ Jesus, and therefore called us to be saints. Flee, therefore, all that is unholy and unclean. In the last verse of the paragraph the Apostle urges both his appeals once more: he recalls the severity and the goodness of God.