Who said "I have learned that fear is often the greatest enemy."?

This quote is attributed to Hadrian.

I have learned that fear is often the greatest enemy. - Hadrian

"I have learned that fear is often the greatest enemy."

Hadrian Fear

Emperor Ancient Rome 76–138

"Nothing is harder to bear than a good example."

"I have always strived to be the best, but I have also learned that the best is not always perfection."

"A man who fears nothing is more dangerous than a man who fears something."

"The greatest luxury is knowledge."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."