first outbreak becomes poisonous if allowed to sour into the vinegar of hatred and revenge; and it is not less dangerous to the breast in which it is entertained than to the person against whom it is directed. Few more troublesome guests can harbour in the heart of man than an angry and revengeful spirit. (3) Anger becomes sinful when it vents itself in ways that are unlawful. It is, for example, one of the principal causes of profane language. Of this sin it is the custom of the world to speak lightly,