If man possessed the courage, if he had the requisite industry to recur to the source of those opinions which are most deeply engraven on his brain; if he rendered to himself a faithful account of the reasons which make him hold these opinions as sacred; if he coolly examined the basis of his hopes, the foundation of his fears, he would find that it very frequently happens, those objects, or those ideas which move him most powerfully, either have no real existence, or are words devoid of meaning, which terror has conjured up to explain some sudden disaster; that they are often phantoms engendered by a disordered imagination, modified by ignorance; the effect of an ardent mind distracted by contending passions, which prevent him from either reasoning justly, or consulting experience in his judgment; that this mind often labours with a precipitancy that throws his intellectual faculties into confusion; that bewilders his ideas; that consequently he gives a substance and a form to chimeras, to airy nothings, which he afterwards idolizes from sloth, reverences from prejudice. A sensible being placed in a nature where every part is in motion, has various feelings, in consequence of either the agreeable or disagreeable effects which he is obliged to experience from this continued action and re-action; in consequence he either finds himself happy or miserable; according to the quality of the sensations excited in him, he will love or fear, seek after or fly from, the real or supposed causes of such marked effects operated on his machine. But if he is ignorant of nature, if he is destitute of experience, he will frequently deceive himself as to these causes; for want of either capability or inclination to recur back to them, he will neither have a true knowledge of their energy, nor a clear idea of their mode of acting: thus until reiterated experience shall have formed his ideas, until the mirror of truth shall have shewn him the judgment he ought to make, he will be involved in trouble, a prey to incertitude, a victim to credulity. Man is a being who brings with him nothing into the world save an aptitude to feeling in a manner more or less lively according to his individual organization: he has no innate knowledge of any of the causes that act upon him: by degrees his faculty of feeling discovers to him their various qualities; he learns to judge of them; time familiarizes him with their properties; he attaches ideas to them, according to the manner in which they have affected him; these ideas are correct or otherwise, in a ratio to the soundness of his organic structure: his judgment is faulty or not, as these organs are either well or ill-constituted; in proportion as they are competent to afford him sure and reiterated experience.