Live your life as though your every act were to become a universal law.

Enthusiasm is always connected with the senses, whatever be the object that excites it. The true strength of virtue is serenity of mind, combined with a deliberate and steadfast determination to execute her laws. That is the healthful condition of the moral life; on the other hand, enthusiasm, even when excited by representations of goodness, is a brilliant but feverish glow which leaves only exhaustion and languor behind.

If a man is often the subject of conversation he soon becomes the subject of criticism.

If justice perishes, human life on Earth has lost its meaning.

Live your life as though your every act were to become a universal law.

Each according to his own way of seeing things, seek one goal, that is gratification.

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.