The Proprieties of the game now form part of the actual Laws.
Bridge is a game in which players should make an active effort to play in an ethical way. As far as you can, try to make each bid and play in an even tempo. Avoid displaying any emotion whether the play of the cards is more or less favourable than you expect.
Personal Ethics, also known as Active Ethics, are the efforts that many players make beyond what the laws require. For example, you are not required to point out your own revokes; many players, in fact, do so because their own ethical approach, i.e. their Personal Ethics, require it.