The longer the test the better you feel when it's over.
The path you're on looks different when you turn around.
Don't say "The last one there is a rotten egg": unless you're absolutely sure there's a slow kid behind you.
It's easier to knock on a door that's not shut all the way.
It's easier to throw sticks on the campfire than to try to restart it when it goes out.
It's easier to see the mistake on someone else's paper.