It's easier to throw sticks on the campfire than to try to restart it when it goes out.
Getting lost teaches you how to read a map.
The teacher can always tell when you did your homework on the bus.
Nobody can pedal the bike for you.
It's easier to knock on a door that's not shut all the way.
Don't say "The last one there is a rotten egg": unless you're absolutely sure there's a slow kid behind you.