Changes

The first step is to think of something else (but in this way, you know, it will be indefinitely repeated); the second is to fight; and the third is to transform. When one has reached the third step, not only is one cured but one has made a permanent progress.

<ref>http://incarnateword.in/cwm/06/10-february-1954#p16 </ref>

The best thing to do is to occupy yourself with something practical which will compel you to concentrate specially: studies, work or some physical occupation for the body which demands attention―anything at all that forces you to concentrate on what you are doing and no longer be a prey to these ramblings.