Whereas our physical being uses five senses to perceive things, our mental being uses only two: seeing and hearing. When we visualize we see things with the help of the mind. It is not everyone who can visualize. When there is no power to visualize it is because things seen that way seem so vague and insubstantial compared with the things we see in the external world. It is difficult for us to think of such visualized things as real. Everything that is before our eyes and ears we consider to be real, whereas whatever comes before the mind's eye we regard as imagination, as something passing, as a dream. It is the same mind that perceives and hears the things of everyday life, yet what it perceives in the other way we think of as being just imagination, although it is actually these things which are the true realities.