According to my experience, it is clear that if each individual makes an effort then he or she can change. Of course, is not immediate and it takes a lot of time. In order to change and deal with emotions it is crucial to analyse which thoughts are useful, constructive and of benefit to us.  I mean mainly those thoughts which make us calmer, more relaxed and which give us peace of mind, versus those thoughts which create uneasiness, fear and frustration. Dali Lama Book of wisdom