Who said "Strength lies not in muscles but in conviction."?

This quote is attributed to Themistocles.

Strength lies not in muscles but in conviction. - Themistocles

"Strength lies not in muscles but in conviction."

Themistocles Strength

Statesman General Ancient Greece 524–460

"A man is not finished when he is defeated. He is finished when he quits."

"The victor will not be asked afterwards whether he told the truth."

"Persuasion is a far more powerful weapon than force."

"Do not despise the enemy that is down, for fortune is fickle."

"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."