Who said "Ask yourself at every moment: 'Is this necessary?'"?

This quote is attributed to Antoninus Pius.

Ask yourself at every moment: 'Is this necessary?' - Antoninus Pius

"Ask yourself at every moment: 'Is this necessary?'"

Antoninus Pius Philosophy

Emperor Ancient Rome 86–161

"It is not the man who has little who is poor, but he whose desires exceed his means."

"Do the duty that lies nearest to you."

"Time is the substance from which I am made."

"Waste no more time arguing what a good man should be. Be one."

"I've seen the worst humanity has to offer."

"Sometimes I wonder if the world is worth saving."

"Every choice shapes our destiny."

"Order is the foundation of a good life."