Here is Meditation Exercise 4 from the Master Key System
Meditation four progresses from the previous exercise.
The intention of the author was to start with the first one and not skip ahead to the next one before each one has been completed as instructed.
Meditation Exercise 4:
This week, after taking your usual position, remove all tension by completely relaxing, then mentally let go of all adverse conditions, such as hatred, anger, worry, jealousy, envy, sorrow, trouble or disappointment of any kind.
You may say that you cannot “let go” of these things, but you can. You can do so by mentally determining to do so, by voluntary intention and persistence.
The reason that some cannot do this is because they allow themselves to be controlled by the emotions instead of by their intellect. But those who will be guided by the intellect will gain the victory.
You will not succeed the first time you try, but practice makes perfect. In this as in everything else, and you must succeed in dismissing, eliminating and completely destroying these negative and destructive thoughts; because they are the seed which is constantly germinating into discordant conditions of every conceivable kind and description. – Charles Haanel