nature of man, are all but one uniform arrangement of cause and effect; and as by the course of those laws, animal life is propagated and sustained for a season, so by the operation of the same laws, decay and mortality are the necessary consequences. CHAPTER IV. SECTON I. SPECULATION ON THE DOCTRINE OF THE DEPRAVITY... OF HUMAN REASON. In the course of our speculation on Divine Providence we proceed next to the consideration of the doctrine of the depravity of human reason: a doctrine derogatory to the nature of man, and the rank and character of being which he holds in the universe, and which, if admitted to be true overturns knowledge and science and renders learning, instruction and books useless and impertinent; inasmuch as reason, depraved or spoiled, would cease to be reason; as much as the mind of a raving madman would of course cease to be rational: admitting the depravity of reason, the consequence would unavoidably follow, that as far as it may be supposed to have taken place in the midst of mankind, there could be no judges of it, in consequence of their supposed depravity; for without the exercise of reason, we could not understand what reason is, which would be necessary for us previously to understand, in order to understand what it is not; or to distinguish it from that which is its reverse. But for us to have the knowledge of what reason is, and the ability to distinguish it from that which is depraved, or is irrational, is incompatible with the doctrine of the depravity of our reason. Inasmuch as to understand what reason is, and to distinguish it from that which is marred or spoiled, is the same to all intents and purposes, as to have, exercise and enjoy, the principle of reason itself, which precludes its supposed depravity: so that it is impossible for us to understand what reason is, and at the same time determine that our reason is depraved; for this would be the same as when we know that we are in possession and exercise of reason, to determine that we are not in possession or exercise of it.