Falsehood never attains to the dignity of entire falseness, but is only an inferior sort of truth
 Henry David Thoreau, A Week on the Concord and Merrimack Rivers (1849). copy citation

Context

“Universally, the innocent man will come forth from the sharpest inquisition and lecturing, the combined din of reproof and commendation, with a faint sound of eulogy in his ears. Our vices always lie in the direction of our virtues, and in their best estate are but plausible imitations of the latter. Falsehood never attains to the dignity of entire falseness, but is only an inferior sort of truth; if it were more thoroughly false, it would incur danger of becoming true. “Securus quo pes ferat, atque ex tempore vivit,” is then the motto of a wise man. For first, as the subtle discernment of the language would have taught us, with all his negligence he is still secure;” source