Who said "The measure of strength is not force, but resolve."?

This quote is attributed to Leonidas I.

The measure of strength is not force, but resolve. - Leonidas I

"The measure of strength is not force, but resolve."

Leonidas I Strength

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."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."