Every thought of a human being is transformed as picture in everybody's mind.
The picture transformed into your mind will be depending upon your thought. If your thought is about success, picture transformed into your mind, will be as if you are getting success.
If your thought is failure, then picture transformed into your mind will be as if you are getting failure.
Never think or doubt, when you begin with something that it will end in failure. If you think so, then that thought or doubt will be transformed as a 'failure' picture in your mind and your sub-conscious mind will direct your action according to that 'failure picture', which naturally your action will end in failure.
On other hand, if you think on other side, thing will end in success, your thought will be transformed into picture of success, and automatically your subconscious mind will direct result to end in success. It is secret of nature.
Because you can yield only what you plant.
Planting of paddy yield only paddy and not wheat.
Planting of success in your mind only yield success and not failure.
Thoughts, picture, and action all have close interaction with each other. They cannot differ and distract at anytime.
For example, if you want to have your own house, think deeply about your dream house as if you have purchased a beautiful house.