“Have courage to make use of your books!”

What is Enlightenment? (1784)
Variant: Have the courage to use your own reason- That is the motto of enlightenment.
Source: Groundwork of the Metaphysics of Morals
Context: Enlightenment is man’s leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! Have the courage to use your own intelligence! is therefore the motto of the enlightenment.

Source: Darkfever

Source: Brida (1990).
Context: When you find your path, you must not be afraid. You need to have sufficient courage to make mistakes. Disappointment, defeat, and despair are the tools God uses to show us the way.

Eric Greitens: How To Became A Resilient Leader https://www.forbes.com/sites/danschawbel/2015/03/10/eric-greitens-how-to-became-a-resilient-leader/#1ee8d8762e54 (March 10, 2015)

Source: The Diary of a Young Girl

Address to the Knights of Columbus Council 969 in Baton Rouge, Louisiana https://web.archive.org/web/20050903023753/http://www.newamerica.net/index.cfm?pg=article&DocID=2291 (January 2005).
2000s