Matthew 24:12

12Because iniquity will abound. How far and wide this evil extends every person ought to know, but there are very few who observe it. For in consequence of the superior clearness with which the light of the gospel discovers the malice of men, even good and properly regulated minds grow cool, and almost lose the desire to exercise benevolence. Each of them reasons thus with himself, that the duties which they perform to one person, or to another, are thrown away, because experience and daily practice show that almost all are ungrateful, or treacherous, or wicked. This is unquestionably a weighty and dangerous temptation; for what could be more unreasonable than to approve of a doctrine, by which the desire of doing good, and the rigor of charity, appear to be diminished? And yet when the gospel makes its appearance, charity, which ought to kindle the hearts of all men with its warmth, rather grows cool. But we must observe the source of this evil, which Christ points out, namely, that many lose courage, because through their weakness they are unable to stem the flood of iniquity which flows on every hand. Christ requires from his followers, on the other hand, such courage as to persist in striving against it; as Paul also enjoins us not to be weary of performing deeds of kindness and beneficence, (2 Thessalonians 3:13.) Although, then, the charity of many, overwhelmed by the mass of iniquities, should give way, Christ warns believers that they must surmount this obstacle, lest, overcome by bad examples, they apostatize. And therefore he repeats the statement, that no man can be saved, unless he strive lawfully, (2 Timothy 2:5,) so as to persevere to the end