The number one key to success in life is sustaining your energy.
— Tony Robbins

No problem can withstand the assault of sustained thinking.
Voltaire sustainable quote

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Perpetual devotion to what a man calls his business is only to be sustained by perpetual neglect of many other things.
— Robert Louis Stevenson

Leadership is the wise use of power. Power is the capacity to translate intention into reality and sustain it.
— Warren Bennis

Enthusiasm... the sustaining power of all great action.
— sustainable quotation by Samuel Smiles