Who said "The greatest discovery is the one made within."?

This quote is attributed to Ovid.

The greatest discovery is the one made within. - Ovid

"The greatest discovery is the one made within."

Ovid

Poet Roman 43–17

"If you wish to be loved, love."

"The good time to leave is when you still want to."

"Nothing is so strong as gentleness, nothing so gentle as real strength."

"Chance is a word void of sense; nothing can happen without a cause."