9-1c1 Your partners and friends have to sign up for your explanation

9-1a You don’t have to be convincing per se, because convincing and true will become identical

The following doesn’t really work with partners and friends:
9-2a It’s easy to convince if people don’t know you enough for what you are not

9-1c2 You can only hope that people you care about will somewhat understand your explanations, but they will never understand you exhaustively