Tao Te Ching

“You can only know what you have thought about and thinking has to be kindled like a fire. Reading can spark this kind of thinking when it forcibly imposes ideas on the mind foreign to it’s mood, beliefs, and prejudices.”

— Arthur Schopenhauer 1788 – 1860 CE via R.J. Hollingdale, Shan Dao
from Parerga and Paralipomena, "Appendices" and "Omissions"