Mark 9:19; Mark 13:4; Mark 13:33; Mark 13:35

19 He answereth him, and saith,O faithless generation, how long shall I be with you? how long shall I suffer you? bring him unto me.
4 Tell us, when shall these things be? and what shall be the sign when all these things shall be fulfilled?
33 Take ye heed, watch and pray: for ye know not when the time is.
35 Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning: