Be on your guard lest your minds should ever be dulled by debauches or drunkenness or the anxieties of life, and lest 'That Day' should come suddenly upon you, like a snare.
Not lightly to let your minds become unsettled, nor yet to be disturbed by any revelation, or by any message, or by any letter, purporting to come from us, to the effect that the Day of the Lord is come.
The Day of the Lord will come like a thief; and on that day the heavens will pass away with a crash, the elements will be burnt up and dissolved, and the earth and all that is in it will be disclosed.
('I am coming like a thief! Happy will he be who is on the watch, and keeps his clothing at hand, so that he will not have to walk about unclothed and let men see his nakedness.')
Therefore remember what you have received and heard, and lay it to heart and repent. Unless you are on the watch, I shall come like a thief, and you will not know at what hour I am coming to you.