Non sis arsholeus nec mercatum cum arsholibus facias

Don’t be a penis, in Latin.

A handy rule when drafting a contract, negotiating one, reading one, going on tour, treating people you meet in your travels, and in life generally.

Be a good egg, and everything usually works out for the best.

There is a school of thought (though it may have but one student) that the central inquiry in any English court can be boiled down to the following simple question: “Who, in the sequence of events with which the court is concerned, was being the biggest dick?”

Note, though: little old ladies are prone to be awarded a handicap in the equity stakes.