A NEW YORK TIMES BEST SELLER A masterpiece of warrior wisdom: how to be resilient, how to overcome obstacles not by "positive thinking" or self-esteem, but by positive action. The best-selling author, Navy SEAL, and humanitarian Eric Greitens offers a self-help book unlike any other.

In 2012, Eric Greitens unexpectedly heard from a former SEAL comrade, a brother-in-arms he hadn’t seen in a decade. Zach Walker had been one of the toughest of the tough. But ever since he returned home from war to his young family in a small logging town, he’d been struggling. Without a sense of purpose, plagued by PTSD, and masking his pain with heavy drinking, he needed help.

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Zach and Eric started writing and talking nearly every day, as Eric set down his thoughts on what it takes to build resilience in our lives. Eric’s letters — drawing on both his own experience and wisdom from ancient and modern thinkers — are now gathered and edited into this timeless guidebook.

Resilience grapples with real hardship. The lessons are deep, yet practical, and the advice leads to clear solutions. This is a profoundly hopeful book: We all face pain, difficulty, and doubt. But with resilience, we can lead vital, flourishing lives.

Greitens shows how we can build purpose, confront pain, practice compassion, develop a vocation, find a mentor, create happiness, and much more. Resilience is an inspiring meditation for the warrior in each of us.