This demonstrates the possibility of mathematics. Kant believes that this can be deduced to the field of metaphysics, that is, there is such a harmonious concept in the world of things themselves and phenomena: that is, his so-called pure reason compares it to practical reason in practice. Analogy is very important in aesthetics.
Kant believes that true moral behavior is an act made purely on the basis of obligation, and doing things for personal utilitarian purposes cannot be considered as moral behavior. Therefore, according to Kant, whether an act conforms to the moral norms does not depend on the consequences of the act, but on the motivation of taking the act.
Kant's other academic thoughts
1, religion
On religious issues, Kant admits that neither experience nor reason can prove the existence of God. But he believes that in order to maintain morality, we must assume the existence of God and soul. He called these beliefs "practical hypothesis", that is, an unprovable hypothesis, but in order to practice, the hypothesis must be established.
2. Astronomy
1754, Kant published a paper on whether the earth's rotation changes and whether the earth will age, which boldly questioned the "theory of cosmic invariance".
1755, Kant published the book General History of Nature and Theory of Celestial Bodies, and put forward the theory of the origin of the solar system for the first time. Kant pointed out in his book that the solar system evolved from nebulae.
3. Political ideas
Politically, Kant was a liberal. He supported the French Revolution and the political system. On Permanent Peace, published in 1795, should be the last far-reaching work that Kant contributed to mankind. The book puts forward the principles of world citizens, world confederations and sovereign countries' non-interference in internal affairs, which are still of practical significance.