“What an immature, self-destructive, antiquated mischief is man! How obscure and gross his prancing and chattering on his little stage of evolution! How loathsome and beyond words boring all the thoughts and self-approval of his biological by-product! this half-formed, ill-conditioned body! this erratic, maladjusted mechanism of his soul: on one side the harmonious instincts and balanced responses of the animal, on the other the inflexible purpose of the engine, and between them man, equally alien from the being of Nature and the doing of the machine, the vile becoming!”

“Enlightenment is man's emergence from his self-imposed immaturity. Immaturity is the inability to use one's understanding without guidance from another.”

“Our civilisation is still in a middle stage, scarcely beast, in that it is no longer wholly guided by instinct; scarcely human, in that it is not yet wholly guided by reason. On the tiger no responsibility rests. We see him aligned by nature with the forces of life - he is born into their keeping and without thought he is protected. We see man far removed from the lairs of the jungles, his innate instincts dulled by too near an approach to free-will, his free-will not sufficiently developed to replace his instincts and afford him perfect guidance... In this intermediate stage he wavers - neither drawn in harmony with nature by his instincts nor yet wisely putting himself into harmony by his own free-will... We have the consolation of knowing that evolution is ever in action, that the ideal is a light that cannot fail. He will not forever balance thus between good and evil. When this jangle of free-will and instinct shall have been adjusted, when perfect understanding has given the former the power to replace the latter entirely, man will no longer vary. The needle of understanding will yet point steadfast and unwavering to the distant pole of truth.”

“Naturally, for a person who finds his identity in something other than his full organism is less than half a man. He is cut off from complete participation in nature. Instead of being a body, he 'has' a body. Instead of living and loving he 'has' instincts for survival and copulation.”

“The bourgeoisie cannot exist without constantly revolutionizing the instruments of production, and thereby the relations of production, and with them the whole relations of society. Conservation of the old modes of production in unaltered forms, was, on the contrary, the first condition of existence for all earlier industrial classes. Constant revolutionizing of production, uninterrupted disturbance of all social conditions, everlasting uncertainty and agitation, distinguish the bourgeois epoch from all earlier ones. All fixed, fast-frozen relations, with their train of ancient and venerable prejudices and opinions, are swept away; all new-formed ones become antiquated before they can ossify. All that is solid melts into air, all that is holy is profaned, and man is at last compelled to face with sober senses his real conditions of life and his relations with his kind.”

“I'll never understand how a man can live his life With his finger on the self-destruct button, Holding it there day after day, Blinded by an obsession to press it But lacking the conviction to do even that.”