Be careful not to become angry if you hear that someone has done something against you, for frequently the actual story is not what you had originally thought it to be.
Learn to react with the following question, "How do I really know that what I heard is true?" People often get angry over incidents that supposedly took place and later found that details had been distorted or left out, and what actually took place was much different from what was originally reported. Also, the context and tone of voice of a given statement can easily be misunderstood. Always be aware of the possibility that what you have heard may not be accurate.
(Chafetz Chaim - Chovos Hashmirah, p.20; Rabbi Pliskin's Gateway to Happiness, p.202)