Through laziness and cowardice a large part of mankind, even after nature has freed them from alien guidance, gladly remain immature.
The public use of a man’s reason must be free at all times, and this alone can bring enlightenment among men…
It is difficult for the isolated individual to work himself out of the immaturity which has become almost natural for him.
Enlightenment is man’s leaving his self-caused immaturity. Immaturity is the incapacity to use one’s intelligence without the guidance of another.
All that is required for this enlightenment is freedom; and particularly the least harmful of all that may be called freedom, namely, the freedom for man to make public use of his reason in all matters.