The proof that this is so is open, manifest, and indisputable. Human experience in the simplest and widest sense of the word attests it. It stands unquestioned amid floods of questions on every other conceivable subject. No system of philosophy, no school of scientific thought, no revelation from the heavens above or the earth beneath can really weaken it. It is not found in books, or received by human contact, or influenced by human example. It is revealed in every man. It is felt by all men. They do not learn it, or deduce it, or believe it merely. They know it. All men do. You do. I do. Many things contribute to this simple and yet supremely wonderful and awful fact of human experience. One of them is the faculty of thought. Man is made a thinking creature, and think he must; and if he thinks, he must, above all, think about himself, about his future, his present, his past. A great French writer--and not a Christian writer--says on this subject: "There is a spectacle grander than the ocean, and that is the conscience. After many conflicts, man yields to that mysterious power which says to him, 'Think.' One can no more prevent the mind from returning to an idea than the sea from returning to a shore. With the sailor this is called 'the tide.' With the guilty it is called 'remorse.' God, by a universal law, upheaves the soul as well as the ocean." And side by side with this thinking faculty, there is the further fact, that God will not leave men alone. On those unerring and resistless tides He sends into the human soul His messages. He visits them. He arouses them. He compels their attention. In His providence, by acts of mercy and of judgment--by sorrow and loss--by stricken days and bitter nights, He makes them remember their sin. All the weapons in His armoury, and all the wisdom of His nature are employed to bring men to a sense of guilt--to prick them to the heart--in order to lead them to recognise and to confess and to turn away from sin. If, therefore, man by any invention had found out a way by which he could escape from the consciousness of evil without putting it away, God would not let him go. Clearly, then, the initial proof of success in religion must be that religion can deal satisfactorily with the conscious guilt of sin. To this high test, all theories, all pretences, all promises must come at last. What are they in their actual effect on the memories and consciences of men in relation to their sin? How do they treat with guilt? How do they meet remorse? Can they silence the clamours of the night? Can they give peace when it is too late to undo what sin has done? Do they suffice amid the deepening shadows of the death chamber--the place where ever and anon the forgotten past comes forth to demand the satisfaction so long delayed?