Who said "What you do in private is what truly defines you."?

This quote is attributed to Spencer Tracy.

What you do in private is what truly defines you. - Spencer Tracy

"What you do in private is what truly defines you."

Spencer Tracy

Actor American 1900–1967

"The best way to find yourself is to lose yourself in the service of others."

"There is a nobility in compassion, a beauty in empathy."

"Success is not final, failure is not fatal."

"The only way to do great work is to love what you do."