Human reason has the peculiar fate in one species of its cognitions that it is burdened with questions which it cannot dismiss, since they are given to it as problems by the nature of reason itself, but which it also cannot answer, since they transcend every capacity of human reason.
We can judge the heart of a man by his treatment of animals.
Laws always lose in energy what the government gains in extent.
Human beings are never to be treated as a means but always as ends.
One who makes himself a worm cannot complain afterwards if people step on him.
Thoughts without content are empty, intuitions without concepts are blind... The understanding can intuit nothing, the senses can think nothing. Only through their union can knowledge arise.