The God of nature has endowed every human being with two sensations,--one of pleasure, and the other of pain,--which serve as guides in all his actions, both physical and moral. They stand as sentinels at the door of his soul to warn him of the approach of evil of every kind. The moment their kingdom is invaded, they raise an alarm, which he soon learns he must heed or suffer a penalty. If he drinks intoxicating drinks, or improperly indulges his appetites and propensities in any way, he learns, by suffering, that is the penalty affixed to the violation of the law of health, and that he can not escape it, and that no one can suffer for him, or make any "atonement for his sins." If he attempts to handle fire, he is soon apprized that he is meddling with something that will injure him; if he commits a moral wrong against a neighbor, it re-acts upon himself in various ways, as explained in Chap. 46. It thus acts as a two-edged sword, which cuts both ways, punishes both the victim and the perpetrator. Man learns by experience that crime will not only injure him, but, in many cases, will destroy him. On the other hand, when he practices virtue, she greets him with her smiles, and fills his soul with pleasure. Let me illustrate: The bells in some city toll the alarm of fire at midnight. In a few minutes thousands of men and boys are congregated on the spot, many of them half-dressed, and without hats or shoes, in order to aid a fellow-being in rescuing his dwelling from the all-devouring element. What prompts them to this act? It is not an injunction of their Bible. No: it was the well-spring of philanthropy leaping up through their souls that prompted to the deed, and not a written Bible. Again: why is a mother's loving, watchful care ever exercised for the protection and welfare of her child? She will endure almost any hardship or privation which its welfare requires. Why does she do this? Her Bible is silent on the subject. It is the impulse of nature welling up from the fountain of maternal affection which prompts to these acts of loving care,--to this moral duty. And this is true of all the other moral duties of life. They are all imbibed al her fountain,--at the fountain of Nature. A man with a good moral development needs no revelation to teach him what is right, no Bible to prompt him to the performance of his duties. We rejoice "with joy unspeakable" that the world is fast learning this moral axiom. The Bible truly teaches us that our moral duties are revealed in the book of nature (Chap. 14). And Christian writers also admit this. Tertullian says, "Why pain yourselves in searching for a divine law while you have that which is common to mankind, and engraven upon the tablet of nature?" This is a wonderful admission for a Christian writer to make, as it virtually concedes there is no moral or religious necessity for a written Bible or revelation. XI. A DIVINE REVELATION ADVERSE TO HUMAN PROGRESS.