All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
Immanuel KantWe assume a common sense as the necessary condition of the universal communicability of our knowledge, which is presupposed in every logic and every principle of knowledge that is not one of skepticism.
Immanuel KantAct so as to use humanity, yourself and others, always as an end and never as a means to an end.
Immanuel KantFreedom in the practical sense is the independence of the power of choice from necessitation by impulses of sensibility
Immanuel KantTo be beneficent when we can is a duty; and besides this, there are many minds so sympathetically constituted that, without any other motive of vanity or self-interest, they find a pleasure in spreading joy around them, and can take delight in the satisfaction of others so far as it is their own work. But I maintain that in such a case an action of this kind, however proper, however amiable it may be, has nevertheless no true moral worth, but is on a level with other inclinations. . . . For the maxim lacks the moral import, namely, that such actions be done from duty, not from inclination.
Immanuel Kant