"If someone forces you to go one mile, go with him two miles"(Matthew 5:41).
There are things that we have to do in order to get by: keep to the speed limit, pay tax, refrain from knocking over the neighbor's trash cans. We are directed to do many things, but the world is enriched by those who do what is not required. Going one mile only preserves the status quo. Going the second mile makes the world better.