“It’s what a man thinks is true which controls his actions, not what is really true.”

Source: City of Fallen Angels

Source: The Way of Kings

Source: The Soul of Man Under Socialism (1891)
Context: For the recognition of private property has really harmed Individualism, and obscured it, by confusing a man with what he possesses. It has led Individualism entirely astray. It has made gain not growth its aim. So that man thought that the important thing was to have, and did not know that the important thing is to be. The true perfection of man lies, not in what man has, but in what man is. Private property has crushed true Individualism, and set up an Individualism that is false. It has debarred one part of the community from being individual by starving them. It has debarred the other part of the community from being individual by putting them on the wrong road and encumbering them.

Preface <!-- p. 21 -->
Source: The Mis-Education of the Negro (1933)
Context: When you control a man's thinking you do not have to worry about his actions. You do not have to tell him not to stand here or go yonder. He will find his "proper place" and will stay in it. You do not need to send him to the back door. He will go without being told. In fact, if there is no back door, he will cut one for his special benefit. His education makes it necessary.
The same educational process which inspires and stimulates the oppressor with the thought that he is everything and has accomplished everything worth while, depresses and crushes at the same time the spark of genius in the Negro by making him feel that his race does not amount to much and never will measure up to the standards of other peoples. The Negro thus educated is a hopeless liability of the race.

Preface
Memoirs of a Superfluous Man (1943)

in "Leisure" (July 1893)

Acres of Diamonds (1915)

Context: It has an unhappy effect upon the human understanding and temper, for a man to be compelled in his gravest investigation of an argument, to consider, not what is true, but what is convenient. The lawyer never yet existed who has not boldly urged an objection which he knew to be fallacious, or endeavoured to pass off a weak reason for a strong one. Intellect is the greatest and most sacred of all endowments; and no man ever trifled with it, defending an action to-day which he had arraigned yesterday, or extenuating an offence on one occasion, which, soon after, he painted in the most atrocious colours, with absolute impunity. Above all, the poet, whose judgment should be clear, whose feelings should be uniform and sound, whose sense should be alive to every impression and hardened to none, who is the legislator of generations and the moral instructor of the world, ought never to have been a practising lawyer, or ought speedily to have quitted so dangerous an engagement.

The Life of Geoffrey Chaucer vol. 1, p. 370 (1803)