From “In Search of the Miraculous” by P.D. Ouspensky

"In the sphere of the emotions it is very useful to try to struggle with the habit of giving immediate expression to all one's unpleasant emotions. Many people find it very difficult to refrain from expressing their feelings about bad weather. It is still more difficult for people not to express unpleasant emotions when they feel that something or someone is violating what they may conceive to be order or justice.

"Besides being a very good method for self-observation, the struggle against expressing unpleasant emotions has at the same time another significance. It is one of the few directions in which a man can change himself or his habits without creating other undesirable habits. Therefore self-observation and self-study must, from the first, be accompanied by the struggle against the expression of unpleasant emotions.