Stephen R.Covey's book The 7 Habits of Highly Effective People has as the final 7^th Habit the following:

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The final habit in Stephen R. Covey's book The 7 Habits of Highly Effective People is "Sharpen the saw." This habit emphasizes the importance of taking care of oneself physically, mentally, emotionally, and spiritually in order to be the most effective and productive. By continuously improving oneself in these areas, one can increase their capacity to tackle challenges and achieve success in all areas of life.

Stephen RCovey's Book the 7 Habits of Highly Effective People Has