''Mother, at times unpleasant thoughts come and disturb us. How can we get rid of them?''
There are several methods.
Generally—but it depends on people—generally, the easiest way is to think of something else. That is, to concentrate one’s attention upon something that has nothing to do with that thought has no connection with that thought, like reading or some work—generally something creative, some creative work. For instance, those who write, while they are writing (let us take simply a novelist), while he is writing, all other thoughts are gone, for he is concentrated on what he is doing. When he finishes writing, if he has no control, the other thoughts will return.