•Why it earns a slot
Why it earns a slot: Eliot builds an entire theory of moral consequence out of provincial marriages and debt ledgers, then closes on the claim that most good in the world comes from people whose lives never get written down.
A young idealist marries a dessicated scholar hoping to matter, and Eliot spends eight hundred pages showing how little any one life actually gets to choose.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.