Who said "The only real failure is the refusal to try."?

This quote is attributed to Fernando Pessoa.

The only real failure is the refusal to try. - Fernando Pessoa

"The only real failure is the refusal to try."

Fernando Pessoa

Poet Portuguese 1888–1935

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

"To be great, be whole; exclude nothing, exaggerate nothing that is not you."

"The worst prison people live in is the fear of what other people think."

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