“Suns are extinguished or become corrupted, planets perish and scatter across the wastes of the sky; other suns are kindled, new planets formed to make their revolutions or describe new orbits, and man, an infinitely minute part of a globe which itself is only an imperceptible point in the immense whole, believes that the universe is made for himself.”

“Let education kindle only those which are truly beneficialto the human species; let it favour those alone which are really necessary to the maintenance of society. The passions of man are dangerous, only because every thing conspires to give them an evil direction.”

“It is thus religion infatuates man from his infancy, fills him with vanity and fanaticism: if he has a heated imagination it drives him on to fury; if he has activity, it makes him a madman, who is frequently as cruel to himself, as he is dangerous and incommodious to others: if, on the contrary, he be phlegmatic or of a slothful habit, he becomes melancholy and is useless to society.”

“All errour is prejudicial: it is by deceiving himself that man is plunged in misery. He neglected Nature; he understood not her laws; he formed gods of the most preposterous kinds: these became the sole objects of his hope, the creatures of his fear, and he trembled under these visionary deities; under the supposed influence of imaginary beings created by himself; under the terrour inspired by blocks of stone; by logs of wood; by flying fish; or else under the frowns of men, mortal as himself, whom his distempered fancy had elevated above that Nature of which alone he is capable of forming any idea.”

“Man cannot cherish his existence any longer than life holds out charms to him: when he is wrought upon by painful sensations, or drawn by contrary impulsions, his natural tendency is deranged; he is under the necessity to follow a new route; this conducts him to his end, which it even displays to him as the most desirable good.”

“...if in the heat of the dispute he insists and asks, 'Am I not the master of throwing myself out of the window?' I shall answer him, no; that whilst he preserves his reason there is no probability that the desire of proving his free agency, will become a motive sufficiently powerful to make him sacrifice his life to the attempt: if, notwithstanding this, to prove he is a free agent, he should actually precipitate himself from the window, it would not be a sufficient warranty to conclude he acted freely, but rather that it was the violence of his temperament which spurred him on to this folly. Madness is a state, that depends upon the heat of the blood, not upon the will. A fanatic or a hero, braves death as necessarily as a more phlegmatic man or a coward flies from it.”

“Man’s life is a line that nature commands him to describe upon the surface of the earth, without his ever being able to swerve from it, even for an instant. He is born without his own consent; his organization does in nowise depend upon himself; his ideas come to him involuntarily; his habits are in the power of those who cause him to contract them; he is unceasingly modified by causes, whether visible or concealed, over which he has no control, which necessarily regulate his mode of existence, give the hue to his way of thinking, and determine his manner of acting. He is good or bad, happy or miserable, wise or foolish, reasonable or irrational, without his will being for any thing in these various states.”