Who said "The power of a smile is underestimated in this world."?

This quote is attributed to Cary Grant.

The power of a smile is underestimated in this world. - Cary Grant

"The power of a smile is underestimated in this world."

Cary Grant Hope

Actor British-American 1904–1986

"I pretend to be a much more macho man than I am, but I get away with it."

"Everyone wants to be Cary Grant. Even I want to be Cary Grant."

"The formula for success is simple: be yourself."

"I wish I had more charm. Maybe then I could make people laugh."

"Every day is a new opportunity."

"Hope is what gets us through difficult times."

"I'm not your enemy, kid. I'm trying to save you."

"Redemption is a long road."