Those ideas, which have no archetype but in the imagination of man, must necessarily take their complexion from his own character; must be clothed with his own passions; must constantly follow the revolutions of his machine; be lively or gloomy; favourable or prejudicial; friendly or inimical; sociable or savage; humane or cruel; according as he whose brain they inhabit shall himself be disposed; in fact, they can never be more than the shadow of the substance he himself interposes between the light and the ground on which they are thrown. A mortal plunged from a state of happiness into misery, whose health merges into sickness, whose joy is changed into affliction, cannot in these vicissitudes preserve the same ideas; these naturally depend every instant upon the variations, which physical sensations oblige his organs to undergo. It will not therefore appear strange that these opinions should be fluctuating, when they depend upon the state of the nervous fluid, upon the greater or less portion of igneous matter floating in the sanguinary vessels. _Theism_, or what is called _Natural Religion_, cannot have certain principles; those who profess it must necessarily be subject to vary in their opinions--to fluctuate in their conduct, which flows out of them. A system founded upon wisdom and intelligence, which can never contradict itself, when circumstances change will presently be converted into fanaticism; rapidly degenerate into superstition; such a system, successively meditated by enthusiasts of very distinct characters, must of necessity experience vicissitudes, and quickly depart from its primitive simplicity. The greater part of those philosophers who have been disposed to substitute theism for superstition, have not felt that it was formed to corrupt itself--to degenerate. Striking examples, however, prove this fatal truth. Theism is almost every where corrupted; it has by degrees given way to those superstitions, to those extravagant sects, to those prejudicial opinions with which the human species is degraded. As soon as man consents to acknowledge invisible powers out of nature, upon which his restless mind will never be able invariably to fix his ideas--which his imagination alone will be capable of painting to him; whenever he shall not dare to consult his reason relatively to those powers, it must necessarily be, that the first false step leads him astray, that his conduct as well as his opinions becomes in the long run perfectly absurd.