On The Gist, Gretchen Rubin explains what self-knowledge has to do with forming lasting habits. To identify your core tendency, try filling out her quiz here. She's the author of Better Than Before and hosts the Happier Podcast, a fellow member of the Panoply network. For the Spiel, please indulge our host in a particularly self-indulgent meditation on simplicity. Join Slate Plus! Members get bonus segments, exclusive member-only podcasts, and more. Sign up for a free trial today at slate.com/gistplus.

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