The life of a good man will hardly improve us more than the life of a freebooter, for the inevitable laws appear as plainly in the infringement as in the observance, and our lives are sustained by a nearly equal expense of virtue of some kind.
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

““What I have learned is mine; I’ve had my thought, And me the Muses noble truths have taught.” We do not learn much from learned books, but from true, sincere, human books, from frank and honest biographies. The life of a good man will hardly improve us more than the life of a freebooter, for the inevitable laws appear as plainly in the infringement as in the observance, and our lives are sustained by a nearly equal expense of virtue of some kind. The decaying tree, while yet it lives, demands sun, wind, and rain no less than the green one. It secretes sap and performs the functions of health. If we choose, we may study the alburnum only. The gnarled stump has as tender a bud as the sapling.” source