Who said "To be strong is to be alone."?

This quote is attributed to Alexandre Dumas, fils.

To be strong is to be alone. - Alexandre Dumas, fils

"To be strong is to be alone."

Alexandre Dumas, fils Strength

Novelist Playwright French 1824–1895

"The heart has its reasons which reason knows nothing of."

"Life is a tragedy when seen in close-up, but a comedy in long-shot."

"Nothing succeeds like success."

"To love is to act."

"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."