Matthew 7:26-27

μωρῷ, Jesus seems here to offend against His own teaching, Matthew 5:22, but He speaks not in passion or contempt, but in deep sadness, and with humane intent to prevent such folly. Wherein lay the second builder's folly? Not in deliberately selecting a bad foundation, but in taking no thought of foundation; in beginning to build at haphazard and anywhere; on loose sand (ἄμμος) near the bed of a mountain torrent. His fault was not an error in judgment, but inconsiderateness. It is not, as is commonly supposed, a question of two foundations, but of looking to, and neglecting to look to, the foundation. In the natural sphere no man in his senses commits such a mistake. But utterly improbable cases have to be supposed in parables to illustrate human folly in religion.