There is no virtue in penance and fasting which waste the body; they are only fanatical and monkish.
For if phenomena are things by themselves, freedom cannot be saved. Nature in that case is the complete and sufficient cause determining every event, and its condition is always contained in that series of phenomena only which, together with their effect, are necessary under the law of nature.
A great part, perhaps the greatest part, of the business of our reason consists in the analysation of the conceptions which we already possess of objects.
Dogmatism is thus the dogmatic procedure of pure reason without previous criticism of its own powers, and in opposing this procedure, we must not be supposed to lend any countenance to that loquacious shallowness which arrogates to itself the name of popularity, nor.
Ich kann, weil ich will, was ich muss.
There are such manifold forms of nature; there are many modifications of the general transcendental concepts of nature that are left undetermined by the laws furnished by pure intellect a priori because these laws only concern the general possibility of nature as an object of the senses.
Only by what a man does heedless of enjoyment, in complete freedom and independently of what he can produce passively from the hand of nature, does he give absolute worth to his existence, as the real existence of a person. Happiness, with all its plethora of pleasures, is far from being an unconditioned good.
Thus there is an analogy between the juridical relation of human actions and the mechanical relation of moving forces. I never can do anything to another man without giving him a right to do the same to me on the same conditions; just as no body can act with its moving force on another body without thereby causing the other to react equally against it.
We must not, however, begin with theology. The religion which is founded merely on theology can never contain anything of morality. Hence we derive no other feelings from it but fear on the one hand, and hope of reward on the other, and this produces merely a superstitious cult. Morality, then, must come first and theology follow; and that is religion.
The spirit of trade cannot coexist with war, and sooner or later this spirit dominates every people.
An appeal to the consent of the common sense of mankind cannot be allowed, for that is a witness whose authority depends merely upon rumor. Says Horace: Quodcunque ostendis mihi sic, incredulus odi.
Our reason has this peculiar fate that, with reference to one class of its knowledge, it is always troubled with questions which cannot be ignored, because they spring from the very nature of reason, and which cannot be answered, because they transcend the powers of human reason.
What would proceed from a continual promotion of living force, which does not let itself climb above a certain grade, other than a rapid death from delight?
To behold virtue in her proper form is nothing else but to contemplate morality stripped of all admixture of sensible things and of every spurious ornament of reward or self-love. How much she then eclipses everything else that appears charming to the affections, every one may readily perceive with the least exertion of his reason, if it be not wholly spoiled for abstraction.
It is certainly a bad sign of common sense to appeal to it as a witness.
You must, therefore you can. A free will and a will subject to moral laws are one and the same thing.
The march of mathematics is pursued on a broad and magnificent highway, which the latest posterity shall frequent without fear of danger or impediment.
How things may be in themselves, without regard to the representations through which they affect us, is utterly beyond the sphere of our cognition.
Thinking is conversation with oneself.
Laziness and cowardice are the reasons why so great a proportion of men, long after nature has released them from alien guidance, nonetheless gladly remain in lifelong immaturity, and why it is so easy for others to establish themselves as their guardians...
I have no knowledge of myself as I am but only as I appear to myself. The consciousness of oneself is therefore very far from being a knowledge of oneself.