Who said "We are only as weak as we allow ourselves to be."?

This quote is attributed to Sirius Black.

We are only as weak as we allow ourselves to be. - Sirius Black

"We are only as weak as we allow ourselves to be."

Sirius Black Strength

Character in Harry Potter and the Prisoner of Azkaban

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"The world isn't split into good people and Death Eaters."

"Brave men don't need to kill to make a point."

"We've all got both light and dark inside us."

"Betrayal is the deepest wound."

"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."