Don’t hang out with young people unless they invite you.

Don’t teach casually, and don’t bother others casually, unless the other party earnestly requests you.

Do not boast about your youthful good looks, strength, or how popular you are with women, etc.

Do not listen to flattery, and do not imagine that you will be favored by a young woman.

Not surly, depressed or suspicious.

Do not despise contemporary styles, tastes, fashions, characters, struggles, etc.

Don’t be harsh on young people, but accept their youthful folly and shortcomings.

Don’t talk much, and don’t talk much about yourself.

Not sure about things, nor stubborn.