Quotes by Immanuel Kant

...I am never to act otherwise than so that I could also will that my maxim should become universal law.

An age cannot bind itself and ordain to put the succeeding one into such a condition that it cannot extend its (at best very occasional) knowledge , purify itself of errors, and progress in general enlightenment. That would be a crime against human nature, the proper destination of which lies precisely in this progress and the descendants would be fully justified in rejecting those decrees as having been made in an unwarranted and malicious m

Even if, by some especially unfortunate fate or by the niggardly provision of stepmotherly nature, [the good will] should be wholly lacking in the power to accomplish its purpose; if with the greatest effort it should yet achieve nothing, and only the good will should remain (not, to be sure, as a mere wish but as the summoning of all the means in our power), yet would it, like a jewel, still shine by its own light as something which has its full value in itself.

If now we attend to ourselves on occasion of any transgression of duty, we shall find that we in fact do not will that our maxim should be universal law, for that is impossible for us; on the contrary, we will that the opposite should remain a universal law, only we assume the liberty of making an exception in our own favor or (just for this time only) in favor of our inclination. Consequently, if we considered all cases from one and the same point of view, namely, that of reason, we should find a contradiction in our own will, namely, that a certain principle should be objectively necessary as a universal law, and yet subjectively should not be universal, but admit of exceptions. As, however, we at one moment regard our action from the point of view of a will wholly conformed to reason, and then again look at the same action from the point of view of a will affected by inclination, there is not really any contradiction, but an antagonism of inclination to the precept of reason, whereby the universality of the principle is changed into mere generality, so that the practical principle of reason shall meet the maxim half way. Now, although this cannot be justified in our own impartial judgement, yet it proves that we do really recognize the validity of the categorical imperative and (with all respect for it) only allow ourselves a few exceptions which we think unimportant and forced from us.

An action done from duty has its moral worth, not in the purpose to be attained by it, but in the maxim according with which it is decided upon; it depends therefore, not on the realization of the object of action, but solely on the principle of volition in accordance with which, irrespective of all objects of the faculty of desire, the action has been performed.

Simply to acquiesce in skepticism can never suffice to overcome the restlessness of reason.

The will is conceived as a faculty of determining oneself to action in accordance with the conception of certain laws. And such a faculty can be found only in rational beings.

Even as to himself, a man cannot pretend to know what he is in himself from the knowledge he has by internal sensation. For as he does not as it were create himself, and does not come by the conception of himself a priori but empirically, it naturally follows that he can obtain his knowledge even of himself only by the inner sense, and consequently only through the appearances of his nature and the way in which his consciousness is affected. At the same time, beyond these characteristics of his own subject, made up of mere appearances, he must necessarily suppose something else as their basis, namely, his ego, whatever its characteristics in itself may be... Now man really finds in himself a faculty by which he distinguishes himself from everything else, even from himself as affected by objects, and that is reason. This being pure spontaneity is even elevated above the understanding. For although the latter is a spontaneity and does not, like sense, merely contain intuitions that arise when we are affected by things (and are therefore passive), yet it cannot produce from its activity any other conceptions than those which merely serve to bring the intuitions of sense under rules, and thereby to unite them in one consciousness, and without this use of the sensibility it could not think at all; whereas, on the contrary, reason shows so pure a spontaneity in the case of what I call ideas [Ideal Conceptions] that it thereby far transcends everything that the sensibility can give it, and exhibits its most important function in distinguishing the world of sense from that of understanding, and thereby prescribing the limits of the understanding itself.

Metaphysics... is nothing but the inventory of all we possess through pure reason, ordered systematically. Nothing here can escape us, because what reason brings forth entirely out of itself cannot be hidden, but is brought to light by reason itself as soon as reasons common principle has been discovered. The perfect unity of this kind of cognition, and the fact that it arises solely out of pure concepts without any influence that would extend or increase it from experience or even particular intuition, which would lead to a determinate experience, make this unconditioned completeness not only feasible but also necessary. Tecum habita, et noris quam sit tibi curta supellex. Dwell in your own house, and you will know how simple your possessions are. - Persius

...Reason should take on anew the most difficult of all its tasks, namely, that of self-knowledge, and to institute a court of justice, by which reason may secure its rightful claims while dismissing all its groundless pretensions, and this not by mere decrees but according to its own eternal and unchangeable laws; and this court is none other than the critique of pure reason itself.

Enlightenment is mans emergence from his self-imposed immaturity. Nothing is required for this enlightenment except freedom; and the freedom in question is the least harmful of all, namely, the freedom to use with and publicly in all matters.

The whole interest of my reason, whether speculative or practical, is concentrated in the three following questions: What can I know? What should I do? What may I hope? (Critique of Pure Reason

Would it not therefore be wiser in moral concerns to acquiesce in the judgement of common reason, or at most only to call in philosophy for the purpose of rendering the system of morals more complete and intelligible, and its rules more convenient for use (especially for disputation), but not so as to draw off the common understanding from its happy simplicity, or to bring it by means of philosophy into a new path of inquiry and instruction?

Genius is the ability to independently arrive at and understand concepts that would normally have to be taught by another person.

The main point of enlightenment is mans release from his self-caused immaturity, primarily in matters of religion.

[To think for oneself] is the maxim of a reason never passive. The tendency to such passivity, and therefore to heteronomy of reason, is called prejudice; and the greatest prejudice of all is to represent nature as not subject to the rules that the understanding places at its basis by means of its own essential law, i.e. is superstition. Deliverance from superstition is called enlightenment; because although this name belongs to deliverance from prejudices in general, yet superstition especially (in sensu eminenti) deserves to be called a prejudice. For the blindness in which superstition places us, which it even imposes on us as an obligation, makes the need of being guided by others, and the consequent passive state of our reason, peculiarly noticeable.

Enlightenment is mans emergence from his self-imposed nonage. Nonage is the inability to use ones own understanding without anothers guidance. This nonage is self-imposed if its cause lies not in lack of understanding but in indecision and lack of courage to use ones own mind without anothers guidance. Dare to know! (Sapere aude.) Have the courage to use your own understanding, is therefore the motto of the enlightenment.

...[W]e must admit that... law must be valid, not merely for men, but for all rational creatures generally, not merely under certain contingent conditions or with exceptions, but with absolute necessity...

Innocence is a splendid thing, only it has the misfortune not to keep very well and to be easily misled.

It is impossible to conceive anything at all in the world, or even out of it, which can be taken as good without qualification, except a good will.