Revelation 3:3

3 Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee.

Ver. 3. And thou shalt not know ] Calamity the more sudden, the more terrible; for, 1. It amates and exanimates a man, as an unexpected storm doth a mariner, and as Satan intended Job’s messengers should do him. 2. It can as little be prevented as Eglon could prevent Ehud’s deadly thrust.