A Warrior knows that an angel ...

A Warrior knows that an angel and a devil are both competing for his sword hand. The devil says: \
A Warrior knows that an angel and a devil are both competing for his sword hand. The devil says: "You will weaken. You will not know exactly when. You are afraid." The angel says: "You will weaken. You will not know exactly when. You are afraid." The Warrior is surprised. Both the angel and the devil have said the same thing. The devil continues: "Let me help you." And the angel says: "I will help you." At that moment the Warrior understands the difference. The words may be the same but these two allies are completely different. And he chooses the angel's hand.

Quotes from the same author

Write your plans in pencil and give God the eraser.
“Defeat exists but not suffering. A true warrior knows that when he loses a battle, he is improving the skill with which he wields a sword. He will be able to fight more skillfully next time.”
The warrior is always trying to improve.
A warrior takes every opportunity to teach himself.
A warrior cannot lower his head - otherwise he loses sight of the horizon of his dreams.