Who said "Patience is not weakness; it is the steel of the wise."?

This quote is attributed to Leonidas I.

Patience is not weakness; it is the steel of the wise. - Leonidas I

"Patience is not weakness; it is the steel of the wise."

Leonidas I Patience

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."

"Patience is a virtue I'm still learning."

"I may be a redhead, but I'm not a hothead."

"Patience is a virtue."

"Patience is a virtue I never learned."