in Thoreau’s Journal:

Men have perchance detected every kind of flower that grows in this township—have pursued it with children’s eyes into the thickest & darkest woods & swamps where the faintest color has betrayed it.

Have they with the like thoroughness plucked every flower of thought which it is possible for a man to entertain—proved every sentiment which it is possible for a man to experience—here? Men have circumnavigated this globe of land and water but how few have sailed out of sight of land over the ocean of knowledge!