Value of Forgetting
The reason that you find it impossible to forget certain incidents and circumstances of life is that you have allowed your mind to go over and over these incidents and thus to make the impression upon the brain so deep that it has become a lasting one. Each review deepens the impressions and makes them more and more indelible. For filing information permanently in the mind this is the proper process. For all temporary purposes, simply make the visual impression: review it to see that it is properly filed, recall it when you wish to use it and then refuse to review or again to see the picture.
To forget means to get-for. You must get some other thought or picture into your mind in place of it. Do not waste time trying to force thoughts or pictures from your mind. Get some other picture or thought in its place as quickly as possible.