There is nothing higher than reason.

Freedom can never be comprehended, nor even can insight into it be gained.

The question is not so much whether there is life on Mars as whether it will continue to be possible to live on Earth

The enjoyment of power inevitably corrupts the judgment of reason, and perverts its liberty.

Both love of mankind, and respect for their rights are duties; the former however is only a conditional, the latter an unconditional, purely imperative duty, which he must be perfectly certain not to have transgressed who would give himself up to the secret emotions arising from benevolence.

Laws always lose in energy what the government gains in extent.

Act so that the maxim of your act could be made the principle of a universal law.