Perseverance is not the absence of doubt, but the continuanc... - Avicenna

"Perseverance is not the absence of doubt, but the continuance despite it."

Avicenna Perseverance

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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."