Doubt is the key that opens the door to knowledge. - Petrarch

"Doubt is the key that opens the door to knowledge."

Petrarch Education

Poet Philosopher Italian 1304–1374

More from Petrarch

"To be everywhere is to be nowhere."

"Five centuries have passed since my birth, yet my heart still beats with the same passions."

"Love is the only thing that makes life worth living."

"The greatest wealth is a poverty of desires."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."