Full engagement requires drawing on four separate but related…

Full engagement requires drawing on four separate but related sources of energy; physical, emotional, mental and spiritual. We must learn to hold ourselves, at least equally accountable for how we manage our energy, physically, emotionally, mentally and spiritually. The mind and body are one. The primary markers of physical capacity are strength, endurance, flexibility, and resilience.

— from Fuel (Energy)

In the book

This is the great insight of the people who study high performers, and it changed how I fly. Full engagement in anything that matters requires drawing on four separate but connected sources of energy: the physical, the emotional, the mental, and the spiritual. Performance, health, and happiness all rest on the skillful management of these, and the truth that took me far too long to learn is this: the resource to manage is not your time but your energy. — Fuel (Energy)

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