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"In every department of physical science there is only so much science, properly so-called, as there is mathematics."
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"Human psychology is the most mysterious thing in the world."

"Science fiction writers foresee the inevitable, and although problems and catastrophes may be inevitable, solutions are not."

"In our world," said Eustace, "a star is a huge ball of flaming gas."Even in your world, my son, that is not what a star is, but only what it is made of."

"Psychology is more concerned with identifying the degree of mental disorder and less with its cure!"

"A drop of water is not immortal; it can be resolved into oxygen and hydrogen. If, therefore, a drop of water were to maintain that it had a quality of aqueousness which would survive its dissolution we should be inclined to be skeptical. In like manner we know that the brain is not immortal..."
Explore more quotes by Immanuel Kant

"A categorical imperative would be one which represented an action as objectively necessary in itself, without reference to any other purpose."

"As nature has uncovered from under this hard shell the seed for which she most tenderly cares - the propensity and vocation to free thinking - this gradually works back upon the character of the people, who thereby gradually become capable of managing freedom; finally, it affects the principles of government, which finds it to its advantage to treat men, who are now more than machines, in accordance with their dignity."

"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."

"Immaturity is the incapacity to use one's intelligence without the guidance of another."

"What is more, we cannot do morality a worse service than by seeing to derive it from examples. Every example of it presented to me must first itself be judged by moral principles in order to decide if it is fit to serve as an original example...even the Holy One of the gospel must first be compared with our ideal of moral perfection before we can recognize him to be such."

"We must admit thatlaw 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."
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