If you don't try to stop whatever is going on in your mind, but merely observe it, eventually you'll begin to feel a tremendous sense of relaxation, a vast sense of openness within your mind - which is in fact your natural mind, the naturally unperturbed background against which various thoughts come and go.
The Joy of Living: Unlocking the Secret and Science of Happiness (ed. Harmony, 2007) - ISBN: 9780307381514