Before you trade sandwiches, check between the bread.
It's more fun to color outside the lines.
It's not enough to be able to spell "magnificence" in your bedroom. You have to be able to spell it at the microphone during the spelling bee.
If you want to zoom down the expert slope tomorrow, you have to fall down the bunny slope today.
Look at the footprints you've made.
Getting lost teaches you how to read a map.