1-2. Don’t be in any rush to become a teacher, my friends. Teaching is highly responsible work. Teachers are held to the strictest standards. And none of us is perfectly qualified. We get it wrong nearly every time we open our mouths. If you could find someone whose speech was perfectly true, you’d have a perfect person, in perfect control of life.
3-5. A bit in the mouth of a horse controls the whole horse. A small rudder on a huge ship in the hands of a skilled captain sets a course in the face of the strongest winds. A word out of your mouth may seem of no account, but it can accomplish nearly anything—or destroy it!