Enlightenment is man’s release from his self -incurred tutelage. Tutelage is man’s inability to make use of his understanding without direction from another. Self-incurred is this tutelage when its cause lies not in lack of reason but in lack of resolution and courage to use it without direction from another. Sapere aude! [Dare to Know!] Have courage to use your own reason!—that is the motto of enlightenment.
Laziness and cowardice are the reasons why so great a portion of mankind, after nature has long since discharged them from external direction, nevertheless remains under lifelong tutelage, and why it is so easy for others to set themselves up as their guardians. It is so easy not to be of age. If I have a book which understands for me, a pastor who has a conscience for me, a physician who decides my diet, and so forth, I need not trouble myself. I need not think, if I can only pay—others will readily undertake the irksome work for me.
That the step to competence is held to be very dangerous by the far greater portion of mankind (and by the entire fair sex)—quite apart from its being arduous—is seen to by those guardians who have so kindly assumed superintendence over them. After the guardians have first made their domestic cattle dumb and have made sure that these placid creatures will not dare take a single step without the harness of the cart to which they are confined, the guardians then show them the danger which threatens if they try to go alone. Actually, however, this danger is not so great, for by falling a few times they would finally learn to walk alone. But an example of this failure makes them timid and ordinarily frightens them away from all further trials.
For any single individual to work himself out of the life under tutelage which has become almost his nature is very difficult. He has come to be fond of this state, and he is for the present really incapable of making use of his reason, for no one has ever let him try it out. Statutes and formulas, those mechanical tools of the rational employment or rather misemployment of his natural gifts, are the fetters of an everlasting tutelage. Whoever throws them off makes only an uncertain leap over the narrowest ditch because he is not accustomed to that kind of free motion. Therefore, there are only few who have succeeded by their own exercise of mind both in freeing themselves from incompetence and in achieving a steady pace.
But that the public should enlighten itself is more possible; indeed, if only freedom is granted, enlightenment is almost sure to follow. For there will always be some independent thinkers, even among the established guardians of the great masses, who, after throwing off the yoke of tutelage from their own shoulders, will disseminate the spirit of the rational appreciation of both their own worth and every man’s vocation for thinking for himself.
For this enlightenment, however, nothing is required but freedom, and indeed the most harmless among all the things to which this term can properly be applied. It is the freedom to make public use of one’s reason at every point. But I hear on all sides, “Do not argue!” The officer says: “Do not argue but drill!” The tax collector: “Do not argue but pay!” The cleric: “Do not argue but believe!” Only one prince in the world [Frederick the Great of Prussia] says, “Argue as much as you will, and about what you will, but obey!” Everywhere there is restriction on freedom.
Which restriction is an obstacle to enlightenment, and which is not an obstacle but a promoter of it? I answer: The public’s use of one’s reason must always be free, and it alone can bring about enlightenment among men. The private use of reason, on the other hand, may often be very narrowly restricted without particularly hindering the progress of enlightenment. By the public use of one’s reason I understand the use which a person makes of it as a scholar before the reading public. Private use I call that which one may make of it in a particular civil post or office which is entrusted to him. . . . Thus it would be ruinous for an officer in service to debate about the suitability or utility of a command given to him by his superior; he must obey. But the right to make remarks on errors in the military service and to lay them before the public for judgment cannot equitably be refused him as a scholar. The citizen cannot refuse to pay the taxes imposed on him; indeed an impudent complaint at those levied on him can be punished as a scandal (as it could occasion general refractoriness). But the same person nevertheless does not act contrary to his duty as a citizen when, as a scholar, he publicly expresses his thoughts on the inappropriateness or even the injustice of those levies. . . .
If we are asked, “Do we now live in an enlightened age?” the answer is, “No,” but we do live in an age of enlightenment. As things now stand, much is lacking which prevents men from being, or easily becoming, capable of correctly using their own reason in religious matters with assurance and free from outside direction. But, on the other hand, we have clear indications that the field has now been opened wherein men may freely deal with these things and that the obstacles to general enlightenment or the release from self-imposed tutelage are gradually being reduced. In this respect, this is the age of enlightenment, or the century of Frederick.