Act only according to that maxim whereby you can at the same time will that it should become a universal law.

The greatest human quest is to know what one must do in order to become a human being.

The sceptics, a kind of nomads, despising all settled culture of the land, broke up from time to time all civil society. Fortunately their number was small, and they could not prevent the old settlers from returning to cultivate the ground afresh, though without any fixed plan or agreement.

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.

Religion is the recognition of all our duties as divine commands.

In law a man is guilty when he violates the rights of others. In ethics he is guilty if he only thinks of doing so.

Maturity is having the courage to use one's own intelligence!