Who said "The proof that stands cannot be moved by doubt."?

This quote is attributed to Euclid.

The proof that stands cannot be moved by doubt. - Euclid

"The proof that stands cannot be moved by doubt."

Euclid Courage

Mathematician Greek -325–-265

"The laws of nature are but the mathematical thoughts of God."

"There is no royal road to geometry."

"What is even more aggravating than a sigmoid journey through a circle is the sheer tedium of squaring it."

"Points, lines, and planes are the foundation of all that we see."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."