Who said "We are defined by what we do when no one is watching."?

This quote is attributed to Professor X.

We are defined by what we do when no one is watching. - Professor X

"We are defined by what we do when no one is watching."

Professor X Truth

"Mutants. Since the discovery of their existence they have been regarded with fear and suspicion by humanity."

"We are the future, Charles, not them. They no longer matter."

"Just because someone stumbles and loses their way doesn't mean they're lost forever."

"What we have to fear is fear itself."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."