Do we know how to truly rest? Who would we be if we did?I’ve been wrestling with these questions since I read Abraham Joshua Heschel’s stunning book “The Sabbath” in college. The ancient Jewish ritual of the Sabbath reserves a full day per week for rest. As it’s commonly practiced, that means about 25 hours every week of no work, very little technology and plenty of in-person gathering.But the Sabbath is a much more radical approach to rest than a simple respite from work and technology. Implicit in the practice of the Sabbath is a stinging critique of the speed at which we live our lives, the ways we choose to spend our time and how we think about the idea of rest itself. That, at least, is a central argument of Judith Shulevitz’s wonderful book, “The Sabbath World: Glimpses of a Different Order of Time.”Shulevitz is a longtime culture critic and currently a contributing writer for The Atlantic. Her book isn’t just about the Sabbath itself, it’s about the world the Sabbath tries to create: one with an entirely different conception of time, morality, rest and community. It’s the kind of world that is wholly different from our own, and one whose wisdom is urgently needed.So, to kick off the new year, I invited Shulevitz on the show to explore what the Sabbath is, the value system embedded within it and what lessons it holds for our lives. I left the conversation feeling awed by how such an ancient practice can feel simultaneously so radical and yet so incredibly urgent.Mentioned:The Sabbath by Abraham Joshua HeschelI and Thou by Martin BuberBook Recommendations:Adam Bede by George EliotThe Seven Day Circle by Eviatar ZerubavelOn the Clock by Emily GuendelsbergerThoughts? Email us at ezrakleinshow@nytimes.com. Guest suggestions? Fill out this form.You can find transcripts (posted midday) and more episodes of “The Ezra Klein Show” at nytimes.com/ezra-klein-podcast, and you can find Ezra on Twitter @ezraklein. Book recommendations from all our guests are listed at https://www.nytimes.com/article/ezra-klein-show-book-recs.“The Ezra Klein Show” is produced by Emefa Agawu, Annie Galvin, Jeff Geld, Rogé Karma and Kristin Lin. Fact-checking by Michelle Harris, Mary Marge Locker and Kate Sinclair. Original music by Isaac Jones. Mixing by Jeff Geld. Audience strategy by Shannon Busta. The executive producer of New York Times Opinion audio is Annie-Rose Strasser. Special thanks to Pat McCusker.