Where would you step your feet when it’s raining? You definitely wouldn’t want to be walking on the grass.
If you like your shoes & have more matters to worry about than cleaning them, then you’re looking for a hard surface such as asphalt or stone paved alleys.
Hard & Strong are some words we use to describe objects as well as characters of human beings. Rain is great so is momentary success. It seems being strong in peace time is not recommended as much as war time.
There’s a beautiful line at the end of The Godfather III that goes like this :
Power wears out those who don’t have it
I could not have put it more elegantly.