Leave things better than you found them.
When I’m out riding my road bike, I’m always surprised by how much trash—and how many nails—I see in the road. I stop and pick up what I can, especially the nails, because I know they could ruin someone else’s ride. I tend to approach work the same way: if I see a problem I can fix or an obstacle I can remove, I try to take care of it, right then and right there.