Seneca suggested that each night we tell ourselves that "You may not wake up tomorrow," and that we greet every morning with the reminder that "You may not sleep again." All of these practices are meant to help us treat our lives, and each other, as the precious gifts they are.

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Quote text and notes from Wikiquote: Susan Cain (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.