Knowledge in youth is wisdom in age. What you learn when you are young will be invaluable when you grow old.
Knowledge is power. Knowledge makes it possible for you to act.
Kill one to warn a hundred. Warn many by punishing a few.
Kill the goose that lays the golden egg. Destroy something that would be a source of wealth or success.
Kindness begets kindness. If you are kind to people, they will be kind to you.