If you have a bald head don't walk out in the sun because you will get burned.
By improving yourself, the world is made better. Be not afraid of growing too slowly. Be afraid only of standing still.
Mary's mouth cost her nothing for she never opens it but at others' expense.
Don't throw stones at your neighbors, if your own windows are glass.
An investment in knowledge pays the best interest.
Would you live with ease, Do what you ought, and not what you please.