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There are principles that govern human effectiveness - natural laws in the human dimension that are just as real, just as unchanging and unarguably there as laws such as gravity are in the physical dimension.

Stephen R. Covey (2013). “The 7 Habits of Highly Effective People: Powerful Lessons in Personal Change”, p.40, Simon and Schuster
There are principles that govern human effectiveness - natural laws in the human dimension that are just as real, just as unchanging and unarguably there as laws such as gravity are in the physical dimension.