[D]iscipline consists in this, that the men who undergo the instruction and have followed it for a certain time are completely deprived of everything which is precious to a man-of the chief human property, rational freedom-and become submissive, machine-like implements of murder in the hands of their organized hierarchic authorities.
Enlightenment is man's leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! Have the courage to use your own intelligence! is therefore the motto of the enlightenment.
Nothing is more stimulating and more salutary to (or for) the inner (or inward) development than the exemple of men devoted to the good. It is in the company of men pursuing a same ideal that the still weavering (or unsteady) soul can set oneself ("se fixer", Fr) and stick to (or attach to) everything that is noble and generous.
The men are much alarmed by certain speculations about women; and well they may be, for when the horse and ass begin to think and argue, adieu to riding and driving.