Books
It’s but little good you’ll do watering last year’s crops.
— George Eliot · Adam Bede

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Watering last year's crops won't do you much good. It's a plain, earthy way of saying that effort spent on what's already finished is wasted, and that attention belongs on what's growing now rather than on what's long past.
Context reviewed