Quote by Avicenna

"A single day of deep understanding surpasses years of surface knowledge."

Avicenna
Philosopher-Physician Persian 980–1037

More from Avicenna

"Knowledge is power."
"The human body is like a machine, and the mind is its engine."
"Healing is a matter of time, but it is sometimes also a matter of opportunity."
"The proof of truth is that it can endure."

All quotes by Avicenna