Sublime
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Endurance is a form of trust, in your capacity over time to absorb the stresses and extremes of the present. I say trust because the math in the moment may break: the opposition overwhelming, your resources faint. So you make eye contact with the enemy. You put down your spear. You turn your back and wait for the tension to break. The quality that ... See more
Degree of strength of will or perseverance. Quiet determination to stick to a course once decided upon. Tendency not to abandon tasks in the face of obstacles. Perseverance, tenacity, doggedness.
Angela Duckworth • Grit: The Power of Passion and Perseverance

I had to side with the strength of something
Gabrielle Bernstein • Spirit Junkie: A Radical Road to Self-Love and Miracles
This one, like most battles we fight in life, would be won or lost in our own minds.
David Goggins • Can't Hurt Me: Master Your Mind and Defy the Odds
The exceptional source of strength is our mind.