Debate thy cause with thy neighbour himself (Matthew 18:15; see on Matthew 18:8). If you have any quarrel with a neighbour, or are drawn into a controversy with him, deal with him privately in a friendly manner.
And discover not a secret to another; rather, the secret of another. Do not bring in a third party, or make use of anything entrusted to you by another person, or of which you have become privately informed, in order to support your cause.