Who said "Act as if what you do makes a difference. It does."?

This quote is attributed to Perry, John.

Act as if what you do makes a difference. It does. - Perry, John

"Act as if what you do makes a difference. It does."

Perry, John

Philosopher American Born 1943 (age 83)

"Things are only impossible until they are not."

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

"Life is what happens when you're busy making other plans."

"In the middle of difficulty lies opportunity."