I get a real sense of how a few slippery little thoughts I might have in, say, the morning before I go to work—maybe after a quarrel with Bianca, a story I read in the paper, or an imagined dialogue with my boss—can weasel their way into the stream of my mind and pool in unseen eddies, from which they hector and haunt me throughout the day.

Dan Harris, 10 percent Happier, loc. 722