When a man despises the grace given him, and forthwith falls into the cares of the world, he delivers himself over to his lusts; and thus in the time of persecution he is offended (cf. Mt. 13:21), and becomes altogether unfruitful. Now the prophet points out the end of such negligence, saying, 'Cursed is he who does the work of the Lord carelessly' (Jer. 48:10). For a servant of the Lord should be diligent and careful, moreover burning like a flame, so that when, by an ardent spirit, he has destroyed all carnal sin, he may be able to draw near to God, Who, according to the expression of the saints, is called 'a consuming fire' (Heb. 12:29).