Roman philosopher Lucious Annaeus Seneca (4BCE-65CE), the most famous and popular philosopher of his day, took the subject of anger seriously enough to dedicate a whole book to the subject. Seneca refused to see anger as an irrational outburst over which we have no control. Instead he saw it as a philosophical problem and amenable to treatment by philosophical argument. He thought anger arose from certain rationally held ideas about the world, and the problem with these ideas is that they are far too optimistic. Certain things are a predictable feature of life, and to get angry about them is to have unrealistic expectations.