From every thing which has been hitherto said, it evidently results that all the errors of mankind, of whatever nature they may be, arise from man's having renounced reason, quitted experience, and refused the evidence of his senses that he might be guided by imagination, frequently deceitful; by authority, always suspicious. Man will ever mistake his true happiness as long as he neglects to study nature, to investigate her laws, to seek in her alone the remedies for those evils which are the consequence of his errors: he will be an enigma to himself, as long as he shall believe himself double; that he is moved by an inconceivable spiritual power, of the laws and nature of which he is ignorant; his intellectual, as well as his moral faculties, will remain unintelligible to him if he does not contemplate them with the same eyes as he does his corporeal qualities; if he does not view them as submitted in every thing to the same impulse, as governed by the same regulations. The system of his pretended free agency is without support; experience contradicts it every instant, and proves that he never ceases to be under the influence of necessity in all his actions; this truth, far from being dangerous to man, far from being destructive of his morals, furnishes him with their true basis by making him feel the necessity of those relations which subsists between sensible beings united in society: who have congregated with a view of uniting their common efforts for their reciprocal felicity. From the necessity of these relations, spring the necessity of his duties; these point out to him the sentiments of love, which he should accord to virtuous conduct; that aversion he should have for what is vicious; the horror he should feel for every thing criminal. From hence the true foundation of _Moral Obligation_ will be obvious, which is only the necessity of talking means to obtain the end man proposes to himself by uniting in society; in which each individual for his own peculiar interest, his own particular happiness, his own personal security, is obliged to display dispositions requisite to conciliate the affections of his associates; to hold a conduct suitable to the preservation of the community; to contribute by his actions to the happiness of the whole. In a word, it is upon the necessary action and re-action of the human will upon the necessary attraction and repulsion of man's soul, that all his morals are bottomed: it is the unison of his will, the concert of his actions, that maintains society; it is rendered miserable by his discordance; it is dissolved by his want of union.