Changing (Part 1 of 7)

Core idea

Changing (Driving (Part 2 of 2) in the source, the book's longest at 41,000 words) is Caro's central argument. The seven parts trace, in painful detail, what power did to Moses. The first part lays out the thesis: Moses's arrogance — inherited from his mother and grandmother — made him unusually susceptible to the addiction of power. Every additional position, every additional acre of condemned land, every additional appropriation reshaped him further from the idealist of 1918. By the late 1930s the change had reached the point where Caro's interviewees, looking back from the 1960s, did not recognize the man.

Why it matters

Arrogance + power = addiction

Caro's thesis is psychological: the arrogance Moses inherited from Bella and Grannie Cohen made him unusually susceptible to power-as-drug. People with high baseline arrogance experience external recognition of their superiority as confirmation, not as a corrective. Each additional victory reinforces the conviction. Moses fed on victories.

Power as personality solvent

Each new appointment — and Moses accumulated twelve by the late 1930s — dissolved another layer of restraint. The friendly young reformer of 1918 became less and less recognizable. By 1940 he was a man his Yale classmates could no longer hold a conversation with. The change was visible from outside and invisible from inside.

Key takeaways

Mental model

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Practical application

Example

The transformation pattern is visible in any long-tenured powerful executive — heads of state, CEOs who run their companies for thirty years, prime ministers who held power across multiple terms. The endpoint personality is rarely the starting personality. Institutional safeguards built around the starting personality fail by the endpoint.

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