Who said "Change is the only constant in life."?

This quote is attributed to Francesco Petrarca.

Change is the only constant in life. - Francesco Petrarca

"Change is the only constant in life."

Francesco Petrarca Change

Poet Italian 1304–1374

"Time is the substance I am made of."

"Nothing is so unbelievable that oratory cannot make it acceptable."

"Who is the happy man? He who has a healthy body, a resourceful mind, and a docile nature."

"Five enemies of peace inhabit with us: avarice, ambition, envy, anger, and pride."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."