Concentration (n.) is the secret of strength.
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Concentration (n.) is the secret of strength in all the management of human affairs.
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Concentration (n.) is the secret of strength in politics, in war, in trade, in short, in all management of human affairs.
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Concentration (n.) is the one prudence in life; the one evil is dissipation.
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Concentration (n.) is the stopping off decisively our miscellaneous activity, and concentrating our force on one or a few points; as the gardener, by severe pruning, forces the sap of the tree into one or two vigorous limbs.