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.