"The product of mental labor - science..." - Quote by Karl Marx

“The bourgeoisie, wherever it has got the upper hand, has put an end to all feudal, patriarchal, idyllic relations. It has pitilessly torn asunder the motley of ties that bound man to his "natural superiors," and left remaining no other nexus between man and man than naked self-interest, than callous "cash payment.”

“Art is always and everywhere the secret confession, and at the same time the immortal movement of its time.”

“Once the inner connection is grasped, all theoretical belief in the permanent necessity of existing conditions collapses before their collapse in practice -- Letter to Ludwig Kugelmann (July 11, 1868)”

“Success is a very hideous thing. Its false resemblance to merit deceives men.”

“For it falls out That what we have we prize not to the worth Whiles we enjoy it, but being lacked and lost, Why, then we rack the value, then we find The virtue that possession would not show us While it was ours.”

“It is long ere we discover how rich we are. Our history, we are sure, is quite tame: we have nothing to write, nothing to infer. But our wiser years still run back to the despised recollections of childhood, and always we are fishing up some wonderful article out of that pond; until, by and by, we begin to suspect that the biography of the one foolish person we know is, in reality, nothing less than the miniature paraphrase of the hundred volumes of the Universal History.”

“Where the world ceases to be the scene of our personal hopes and wishes, where we face it as free beings admiring, asking and observing, there we enter the realm of Art and Science.”

“The only way to study the mind is to get at facts, and then intellect will arrange them and deduce the principles.”

“Don't set out to teach theism from your natural history... You spoil both.”