Enlightenment is man's release from his self incurred tutelage.
Tutelage is man's inability to make use of his understanding without direction from another.
Self-incurred is this tutelage when its cause lies not in lack of reason but in lack of resolution and courage to use it without direction from another.
" Have courage to use your own reason" that's the motto of enlightenment .

Author: Immanuel Kant