Resilience is built, not innate — a muscle, not a trait

Sandberg and Grant open by rejecting the assumption that resilience is a fixed personal quality some people simply have and others lack. Drawing on psychological research, they argue resilience functions more like a muscle: it can be strengthened through specific practices, and it fluctuates within the same person depending on circumstances and habits of thought, rather than existing as a stable trait one either possesses or doesn't.

This reframing shifts the question from "am I a resilient person" to "what can I do right now to build resilience," a far more actionable question. The book treats Sandberg's own experience after her husband's sudden death as a case study in this deliberate building process — not because she was naturally strong, but because she and those around her applied specific, learnable strategies drawn from grief research.

Grant's academic research on organizational and individual resilience underpins this claim throughout, giving the personal narrative an empirical backbone.

Takeaway: resilience isn't something you either have or don't — it's a set of practices you can start building the moment you need them.