Who said "The greatest battles are often fought within the mind."?

This quote is attributed to Luís de Camões.

The greatest battles are often fought within the mind. - Luís de Camões

"The greatest battles are often fought within the mind."

Luís de Camões Motivation

Poet Portuguese 1524–1580

"Love is the great mover of all things."

"The brave man is not he who does not feel afraid, but he who conquers that fear."

"Time is the fire in which we burn."

"Fortune favors the bold."

"I believe in working hard for what you want."

"Never underestimate the power of determination."

"I don't need a reason to fight."

"The most important thing is the mission. Nothing else matters."