Freedom can never be comprehended, nor even can insight into it be gained.
Act in such a way that you will be worthy of being happy.
Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.
It is through good education that all the good in the world arises.
The greatest problem for the human species, the solution of which nature compels him to seek, is that of attaining a civil society which can administer justice universally.
There is nothing higher than reason.