Courage is a muscle built through repeated small acts, not a fixed trait

Holiday's foundational claim is that courage isn't an innate quality some people simply have and others lack; it's closer to a skill or muscle developed through repeated practice, starting with small, low-stakes moments of facing discomfort rather than avoiding it. Someone who speaks up in a minor disagreement, admits a mistake, or takes a small professional risk is training the same underlying capacity that later enables larger acts of courage under greater pressure.

He argues that avoiding small moments of courage — staying silent to keep the peace, deferring to consensus against your own judgment — doesn't just miss an opportunity; it actively weakens the capacity for courage the next time it's needed, since avoidance itself is a kind of practice, just in the wrong direction.

This reframes courage from a rare, heroic quality into an everyday practice available to anyone willing to consistently choose the slightly harder, more honest option in ordinary situations.

Takeaway: practice courage on small daily stakes so the capacity is available when the stakes get large.