Immanuel Kant
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"Immanuel Kant" was a List of German-language philosophers/German philosopher who is widely considered to be a central figure of modern philosophy. He argued that fundamental concepts structure human experience, and that reason is the source of morality. His thought continues to have a major influence in contemporary thought, especially the fields of metaphysics, epistemology, ethics, political philosophy, and aesthetics.

Kant's major work, the Critique of Pure Reason (Kritik der reinen Vernunft, 1781), aimed to explain the relationship between reason and human experience. With this project, he hoped to move beyond what he took to be failures of traditional philosophy and metaphysics. He attempted to put an end to what he considered an era of futile and speculative theories of human experience, while resisting the Philosophical skepticism/skepticism of thinkers such as David Hume.

Kant argued that our experiences are structured by necessary features of our minds. In his view, the mind shapes and structures experience so that, on an abstract level, all human experience shares certain essential structural features. Among other things, Kant believed that the concepts of space and time are integral to all human experience, as are our concepts of cause and effect.

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Experience without theory is blind, but theory without experience is mere intellectual play.

The inscrutable wisdom through which we exist is not less worthy of veneration in respect to what it denies us than in respect to what it has granted.

The height of progress, when people's propensity to strive for what is dispensable begins to interfere with what is indispensable, is called luxury.

The universal and lasting establishment of peace constitutes not merely a part, but the whole final purpose and end of the science of right as viewed within the limits of reason.

So act that your principle of action might safely be made a law for the whole world.

Science is organized knowledge. Wisdom is organized life.

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

He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.

Act as if the maxim of your action were to become through your will a general natural law.

It is beyond a doubt that all our knowledge that begins with experience.

Do what is right, though the world may perish.

Always recognize that human individuals are ends, and do not use them as means to your end.

The history of the human race, viewed as a whole may be regarded as the realization of a hidden plan of nature to bring about a political constitution, internally, and for this purpose, also externally perfect, as the only state in which all the capacities implanted by her in mankind can be fully developed.

Have patience awhile; slanders are not long-lived. Truth is the child of time; erelong she shall appear to vindicate thee.

If man makes himself a worm he must not complain when he is trodden on.

From timber so crooked as that from which man is carved, nothing entirely straight can be made.

Human reason has this peculiar fate that in one species of its knowledge it is burdened by questions which, as prescribed by the very nature of reason itself, it is not able to ignore, but which, as transcending all its powers, it is also not able to answer.

Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.

Ours is an age of criticism, to which everything must be subjected. The sacredness of religion, and the authority of legislation, are by many regarded as grounds for exemption from the examination by this tribunal, But, if they are exempted, and cannot lay claim to sincere respect, which reason accords only to that which has stood the test of a free and public examination.

That all our knowledge begins with experience, there is indeed no doubt....but although our knowledge originates WITH experience, it does not all arise OUT OF experience.

...as to moral feeling, this supposed special sense, the appeal to it is indeed superficial when those who cannot think believe that feeling will help them out, even in what concerns general laws: and besides, feelings which naturally differ infinitely in degree cannot furnish a uniform standard of good and evil, nor has any one a right to form judgments for others by his own feelings...

Criticism alone can sever the root of materialism, fatalism, atheism, free-thinking, fanaticism, and superstition, which can be injurious universally; as well as of idealism and skepticism, which are dangerous chiefly to the Schools, and hardly allow of being handed on to the public.

'Human reason is by nature architectonic.'