The one prudence in life is concentration; the one evil is dissipation

Amen. From Ralph Waldo Emerson in his The Conduct of Life.

“Enlarge not thy destiny,” said the oracle: “endeavor not to do more than is given thee in charge.” The one prudence in life is concentration; the one evil is dissipation: and it makes no difference whether our dissipations are coarse or fine; property and its cares, friends, and a social habit, or politics, or music, or feasting. Everything is good which takes away one plaything and delusion more, and drives us home to add one stroke of faithful work. Friends, books, pictures, lower duties, talents, flatteries, hopes, — all are distractions which cause oscillations in our giddy balloon, and make a good poise and a straight course impossible. You must elect your work; you shall take what your brain can, and drop all the rest. Only so, can that amount of vital force accumulate, which can make the step from knowing to doing. No matter how much faculty of idle seeing a man has, the step from knowing to doing is rarely taken. ‘Tis a step out of a chalk circle of imbecility into fruitfulness. Many an artist lacking this, lacks all: he sees the masculine Angelo or Cellini with despair. He, too, is up to Nature and the First Cause in his thought. But the spasm to collect and swing his whole being into one act, he has not. The poet Campbell said, that “a man accustomed to work was equal to any achievement he resolved on, and, that, for himself, necessity not inspiration was the prompter of his muse.”