Jesus said, “And everyone who hears these words of mine and does not do them will be like a foolish man who built his house on the sand” (Matt. 7:26). Jesus talks about everyone who disobeys His words. To disobey the words of Jesus is to disobey the will of God. Jesus is talking about everyone who disobeys God’s will.
Jesus switches from the wise builder to the foolish builder. The wise builder builds his house on the rock. But the foolish builder builds his house on the sand.
Three things will apply to you if you disobey the will of God. First, you are “foolish.” The word, “foolish” is from the Greek, moros, where we get our English word, “moron.” It means “stupid.” (Gingrich)
But Matthew is not talking about mental stupidity. In Matt. 23:17, Matthew writes, “You blind fools! For which is greater, the gold or the temple that has made the gold sacred?” Here Matthew links the word “blind” with “fools.” He describes the fool as blind. The adjective “blind” (tuphlos) means, “metaphorically, of mental and spiritual blindness, often the result of self-deception, unable to understand (MT 15.14).” (Friberg) Hence, in Matthew, the fool is blind. The fool is stupid, in the sense that he is blind. He is unable to understand. He deceives himself. He thinks he understands the things of God. But actually, he does not.
Thus, if you hear God’s Word today, but you disregard it or you disobey it, you are a foolish person. You are spiritually stupid. You cannot see spiritually. You cannot understand the things of God. To your mind, you think that you are doing the right thing. But you do not really understand the eternal value of obeying God in your life. You fail to see the earth-shaking importance of building your life on the will of God.