Thinking in pictures precedes thinking in words.

Thrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.

I learned to honor human beings, and I would find myself far more useless than the common laborer if I did not believe that this consideration could impart to all others a value establishing the rights of humanity.

Man must be disciplined, for he is by nature raw and wild.

A lie is the abandonment and, as it were, the annihilation of the dignity by man.

Out of the crooked timber of humanity, no straight thing was ever made.

Enlightenment is man's emergence from his self-imposed nonage. Nonage is the inability to use one's own understanding without another's guidance. This nonage is self-imposed if its cause lies not in lack of understanding but in indecision and lack of courage to use one's own mind without another's guidance. Dare to know!