Who said "The key to happiness is gratitude."?

This quote is attributed to Prince.

The key to happiness is gratitude. - Prince

"The key to happiness is gratitude."

Prince Happiness

Musician Songwriter Producer American 1958–2016

"Dearly beloved, we are gathered here today to get through this thing called life"

"I'm not a woman, I'm a man"

"Sign O' the Times"

"Money don't matter 2 me, I don't care about wealth"

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."