Who said "A man's greatest battle is the one within his own soul."?

This quote is attributed to Leonidas I.

A man's greatest battle is the one within his own soul. - Leonidas I

"A man's greatest battle is the one within his own soul."

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."