The only thing that is good without qualification is a good will.
One who makes himself a worm cannot complain afterwards if people step on him.
Maximum individuality within maximum community
Space and time are the framework within which the mind is constrained to construct its experience of reality.
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.
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.