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- why does geometric treatment of gravitation require equivalence of inertial and gravitational mass?

In the first sentence of Chapter 2 in Ben Crowell's "General Relativity" he states:

"The geometrical treatment of space, time, and gravity only requires as its basis the equivalence of inertial and gravitational mass".

This is stated as if it's an obvious fact, but I don't understand why. Why does a geometric treatment of gravitation require the equivalence principle? I must be missing something obvious. What am I missing here?

"The geometrical treatment of space, time, and gravity only requires as its basis the equivalence of inertial and gravitational mass".

This is stated as if it's an obvious fact, but I don't understand why. Why does a geometric treatment of gravitation require the equivalence principle? I must be missing something obvious. What am I missing here?