Take great care to restrain your tongue and be circumspect. Let only discretion and charity open your mouth. And practice the advice of all the Saints to break silence only with words that are worth more than silence. Silence is one of the most certain signs that God dwells in a soul.
People have always wondered at the saints, that they are able to walk around serene, whatever happens. But that is because they can choose where they'll be. They don't have to be angry. You see the difference between having scattered emotions and having a fully vibrating, controlled emotional body. This body is made from energy created from choice, from the effort involved in making choices. But it is necessary to practice; then something is possible.