The day of the Lord will come like a thief–it will be a day on which the heavens will pass away with a rushing noise, the elements be destroyed in the fierce heat, and the earth and all the works of man be utterly burnt up.
The revelation given by Jesus Christ, which God granted Him, that He might make known to His servants certain events which must shortly come to pass: and He sent His angel and communicated it to His servant John.
Be mindful, therefore, of the lessons you have received and heard. Continually lay them to heart, and repent. If, however, you fail to rouse yourself and keep awake, I shall come upon you suddenly like a thief, and you will certainly not know the hour at which I shall come to judge you.