“Challenge is the core and the mainspring of all human activity. If there's an ocean, we cross it; if there's a disease, we cure it; if there's a wrong, we right it; if there's a record, we break it; and finally, if there's a mountain, we climb it.”
Quote by James Ramsey Ullman
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Source: The Personal Efficiency Program: How to Get Organized to Do More Work in Less Time
Source: The Fifth Discipline: The Art and Practice of the Learning Organization: First edition
