"The number of the hours in a day is fixed, but the quantity and quality of energy available to us is not. It is our most precious resource. The more we take responsibility for the energy we bring to the world, the more empowered and productive we become. The more we blame others or external circumstances, the more negative and compromised our energy is likely to be."
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Source : Jim Loehr, Dr. James E. Loehr, Tony Schwartz (2005). “The Power of Full Engagement: Managing Energy, Not Time, Is the Key to High Performance and Personal Renewal”, p.5, Simon and Schuster
