Don’t give advice.
助言をしない。
The first rule is not to give advice when people don’t ask you for it.
The second rule is not to give advice if they’re not willing to hear it and/or follow it.
The third rule is not to give advice if they don’t even know what they don’t know.
The fourth rule is not to give advice if they randomly approach others and ask for it.
The fifth rule is not to give advice that you don’t follow yourself.
The sixth rule is to forget all the rules mentioned above, and think about your own rule about giving advice.