Who said "The strongest people are often the quietest."?

This quote is attributed to Rosario Castellanos.

The strongest people are often the quietest. - Rosario Castellanos

"The strongest people are often the quietest."

Rosario Castellanos Strength

Novelist Poet Mexican 1925–1974

"I am my own muse. I am the subject I know best. The subject I want to know better."

"Silence is the only language God did not give to man to deny it to women."

"Women are not born; they are made."

"I write because I have an inner need to do so."

"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."