What wears the soul out is not the work of life itselfit is its drudgery, its monotony, its blind vagueness, its apparent purposelessness.

These are the two golden rules regarding concentration; but we must not suppose that because we have to be on our guard against idle drifting there is to be no such thing as repose; on the contrary it is during periods of repose that we accumulate strength for action; but repose does not mean a state of purposelessness.