Ecclesiastes 1:45-47

45 Two shall be grinding at the mill, the one shall be taken, and the other left;

46 And what I say unto one, I say unto all men; watch, therefore, for you know not at what hour your Lord doth come.

47 But know this, if the good man of the house had known in what watch the thief would come, he would have watched, and would not have suffered his house to have been broken up, but would have been ready.