Who said "To be occupied in doing good is the truest way to be happy."?

This quote is attributed to Denis Diderot.

To be occupied in doing good is the truest way to be happy. - Denis Diderot

"To be occupied in doing good is the truest way to be happy."

Denis Diderot Happiness

Philosopher Writer French 1713–1784

"The world is for those who think."

"Man will never be free until the last king is strangled with the entrails of the last priest."

"Nothing can be believed unless it is seen."

"I am convinced the mind can be developed to the point where success is inevitable."

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."