Seek not the favor of the multitude; it is seldom got by honest and lawful means. But seek the testimony of few; and number not voices, but weigh them.
All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.
I had therefore to remove knowledge, in order to make room for belief.
But although all our knowledge begins with experience, it does not follow that it arises from experience.
Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.
It is not necessary that whilst I live I live happily; but it is necessary that so long as I live I should live honourably.
Experience without theory is blind, but theory without experience is mere intellectual play.
Immaturity is the incapacity to use one’s intelligence without the guidance of another.
From such crooked wood as that which man is made of, nothing straight can be fashioned.
Two things awe me most, the starry sky above me and the moral law within me.