Sometimes? Or all the time?
Mark 13:1 And as he went out of the temple, one of his disciples saith unto him, Master, see what manner of stones and what buildings are here! 2 And Jesus answering said unto him, Seest thou these great buildings? there shall not be left one stone upon another, that shall not be thrown down. 3 And as he sat upon the mount of Olives over against the temple, Peter and James and John and Andrew asked him privately, 4 Tell us, when shall these things be? and what shall be the sign when all these things shall be fulfilled?