Who said "The greatest enemies we face are within ourselves."?

This quote is attributed to Leonidas I.

The greatest enemies we face are within ourselves. - Leonidas I

"The greatest enemies we face are within ourselves."

Leonidas I Philosophy

King Warrior Ancient Greece 540–480

"This is Sparta!"

"Spartans! Tonight we dine in hell!"

"A man's true measure is taken not in a moment of comfort and convenience, but in a moment of challenge and adversity."

"Freedom isn't free, it requires sacrifice and courage."

"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."