Now, from that extraordinary position a reaction was of course inevitable. Man could not go on for ever describing himself as "a worm" and an outcast, or avowing himself "a miserable sinner" and a limb of Satan; and consequently, with an awakened sense of human dignity, inspiring him, not with vainglory, but with an ever-deepening self-reverence, the ascription of all agency to supernatural power began to be seriously curtailed. "The Divine right of kings" went its way with other archaisms into the limbo of oblivion, from which the reigning monarch in Prussia would appear to be vainly endeavouring to rescue it, while man began to realise that the causes of natural and human phenomena were to be sought in nature and in man. As a consequence of this, a new theory of conscience began to take shape, which was ultimately described by one of the boldest of later English philosophical writers, the late Professor Clifford, as "the voice of man commanding us to live for the right".[1] In these definitions of conscience, as "the voice of God" and "the voice of man," we have an instance of propositions which in logic are called _contraries_. Both, therefore, cannot be exclusively and simultaneously true, but both may be simultaneously false. Thus, "all men are white" and "no men are white" are contraries, but they are both false. And this, I submit, is the judgment to be pronounced on these two exclusive definitions of conscience. Neither is, exclusively speaking, true, but there is a measure of truth common to both, and that measure it will be the purpose of the following remarks to determine. But, before going any farther, we must get a clear idea of what we mean by conscience. In a general way, of course, we all know what is meant by the word: an appeal to conscience would be intelligible by every one. We understand it to be a faculty which decides on a definite course of action when alternatives of good and evil are before us. We look upon it as an instinct, magnetic in its power, incessantly prompting us towards the fulfilment of duty, and gravely reproaching us on its dereliction. We recognise it as the sweetest and most troublesome of visitants; sweetest when the peace unspeakable sinks into our souls, most troublesome when we have been guilty of a great betrayal. So delicate is that voice that nothing is easier than to stifle it; so clear is it that no one by any possibility can mistake it.