This is truly humbling to proud human nature. Think of a clear-headed, highly educated, deeply learned, intellectual man, a profound thinker, a powerful reasoner, a thorough philosopher, who has won the honors, the medals, the degrees, that this world's universities can bestow; and yet he is blind to everything spiritual, heavenly, divine. He gropes in moral darkness. He thinks he sees, assumes the right to judge and pronounce upon things, even upon Scripture and upon God Himself. He undertakes to decide what is fitting for God to say and to do. He sets up his own mind as the measure in the things of God. He reasons upon immortality, upon eternal life, and eternal punishment. He deems himself perfectly competent to give judgment in reference to all these solemn and weighty matters; and all the while his eyes have never been opened. How much is his judgment worth? Nothing! Who would take the opinion of a man who, if his eyes were only opened, would reverse that opinion in reference to everything heavenly and divine? Who would think for a moment of being guided by a blind man? But how do we know that every man in his natural, unconverted state is blind? Because, according to Paul's commission, the very first thing which the gospel is to do for him is "to open his eyes." This proves, beyond all question, that he must be blind. Paul was sent to the people and to the Gentiles--that is, to the whole human family--to open their eyes. This proves, to a divine demonstration, that all are by nature blind. But there is more than this. Man is not only blind, but he is in "darkness." Supposing for a moment that a person has his eyesight, of what use is it to him if he is in the dark? It is the double statement as to man's state and position. As to his state, he is blind. As to his position, he is in darkness; and when his eyes are opened, and divine light streams in upon his soul, he then judges himself and his ways according to God. He sees his folly, his guilt, his rebellion, his wild, infidel reasonings, his foolish notions, the vanity of his mind, his pride and ambition, his selfishness and worldliness--all these things are judged and abhorred. He repents, and turns right round to the One who has opened his eyes and poured in a flood of living light upon his heart and conscience.