Who said "You do not know how much you can do until you try."?

This quote is attributed to Ezra Pound.

You do not know how much you can do until you try. - Ezra Pound

"You do not know how much you can do until you try."

Ezra Pound Perseverance

Poet Critic American 1885–1972

"Make it new."

"The natural object is always the adequate symbol."

"Poetry is a sort of inspired mathematics."

"A poet is a light and winged and holy thing."

"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."