New York Times op-ed columnist David Brooks is on a mission to help people live a deeper and more joyful life. In his new book, "The Second Mountain: The Quest for a Moral Life," Brooks argues that life is defined by two mountains: On the first mountain, people tackle personal goals, and on the second, people learn to focus on service to others. Brooks joins "CBS This Morning" to discuss how he came out of the valley to value relationships with people over personal success.

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