Who said "Strength is knowing when not to use your power."?

This quote is attributed to Fernando Pessoa.

Strength is knowing when not to use your power. - Fernando Pessoa

"Strength is knowing when not to use your power."

Fernando Pessoa Strength

Poet Portuguese 1888–1935

"I am not I; I am this one walking beside me whom I do not see."

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"I love without knowing how, or what, or even if I exist."

"Strength comes from within."

"A woman should be proud of who she is."

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"The only thing I'm good at is killing."