If you persuade yourself that you can do a certain thing, provided this thing be possible, you will do it, however difficult it may be. If, on the contrary, you imagine that you cannot do the simplest thing in the world, it is impossible for you to do it, and molehills become for you unscalable mountains.

The Method and Practice of Autosuggestion (ed. DoctorZed Publishing, 2011) - ISBN: 9781864765663