Enlightenment is man's emergence from his self-imposed immaturity. Immaturity is the inability to use one's understanding without guidance from another. This immaturity is self-imposed when its cause lies in lack of resolve and courage to use it without guidance from another. All our knowledge begins with the senses, proceeds to understanding, and ends with reason. There is nothing higher than reason. Have courage to use your own reason. That is the motto of enlightenment.