Besides the noble art of getting things done, there is the noble art of leaving things undone. The wisdom of life consists in the elimination of non-essentials.

As quoted in Pearls of Wisdom: A Harvest of Quotations From All Ages (1987) by Jerome Agel and Walter D. Glanze, p. 46. From The Importance of Living: "besides the noble art of getting things done, there is a nobler art of leaving things undone" (p. 162), "the wisdom of life consists in the elimination of non-essentials" (p. 10).