Some Worm In His Head Affecting Productivity

"I sometimes despair of getting anything quite simple and honest done in this world by the help of men. They would have to be passed through a powerful press first, to squeeze their old notions out of them, so that they would not soon get upon their legs again; and then there would be some one in the company with a maggot in his head, hatched from an egg deposited there nobody knows when, for not even fire kills these things, and you would have lost your labor. Never- theless, we will not forget that some Egyptian wheat was handed down to us by a mummy."
(Henry David Thoreau. Walden)