"So behave that the odor of your actions may enhance the general sweetness of the atmosphere, that when we behold or scent a flower, we may not be reminded how inconsistent your deeds are with it; for all odor is but one form of advertisement of a moral quality, and if fair actions had not been performed, the lily would not smell sweet. The foul slime stands for the sloth and vice of man, the decay of humanity; the fragrant flower that springs from it, for the purity and courage which are immortal."

Source: Henry David Thoreau (2017). “Collected Works of Henry David Thoreau (Illustrated): Philosophical and Autobiographical Books, Essays, Poetry, Translations, Biographies & Letters: Walden, Civil Disobedience, The Maine Woods, Cape Cod, Slavery in Massachusetts, Walking…”, p.1093, e-artnow