Quotation by Henry David Thoreau

Such is always the pursuit of knowledge. The celestial fruits, the golden apples of the Hesperides, are ever guarded by a hundred-headed dragon which never sleeps, so that it is an Herculean labor to pluck them.
Henry David Thoreau (1817–1862), U.S. philosopher, author, naturalist. "Wild Apples" (1862), in The Writings of Henry David Thoreau, vol. 5, p. 307, Houghton Mifflin (1906).

Thoreau refers here to one of the labors of Hercules in Greek mythology.
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