Does our thinking affect our physical bodies? And can it affect the world “out there”? Many people believe that our thoughts are not merely the result of brain activity, but a real force with the ability to produce objective results. If so, how does it work? Theosophical teachings present a clear and systematic study of the hidden power inherent in our thinking. A deeper knowledge of our mental nature will help us master this important power to promote spiritual growth for ourselves and others.