10. But the day of the Lord will come. This has been added, that the faithful might be always watching, and not promise to-morrow to themselves. For we all labor under two very different evils — too much haste, and slothfulness. We are seized with impatience for the day of Christ already expected; at the same time we securely regard it as afar off. As, then, the Apostle has before reproved an unreasonable ardor, so he now shakes off our sleepiness, so that we may attentively expect Christ at all times, lest we should become idle and negligent, as it is usually the case. For whence is it that flesh indulges itself except that there is no thought of the near coming of Christ?
What afterwards follows, respecting the burning of heaven and earth, requires no long explanation, if indeed we duly consider what is intended. For it was not his purpose to speak refinedly of fire and storm, and other things, but only that he might introduce an exhortation, which he immediately adds, even that we ought to strive after newness of life. For he thus reasons, that as heaven and earth are to be purged by fire, that they may correspond with the kingdom of Christ, hence the renovation of men is much more necessary. Mischievous, then, are those interpreters who consume much labor on refined speculations, since the Apostle applies his doctrine to godly exhortations.