Our personal Inner Nature, which we all have in common, is something we need to understand if we are to know ourselves. The common notion that a person is a physical body and has a soul might be better reversed. Thinking that the physical body is the real person is like mistaking a house for the person who lives inside it. Theosophy teaches that we are really the "monad" or inner unity, a fragment of divinity, a spark of the divine flame, which lives in many houses.
A body is our interface with the environment around us. In fact we have as many interfaces or bodies or energy fields as we have environments. In addition to the dense physical environment, we have environments of vital energy, feelings, thoughts, and intuitions. Our interface with each environment performs two functions. On the one hand, it is the channel through which we experience and influence that environment. On the other hand, the kind of interface we have with an environment also limits how much of that environment we can experience and respond to.
For example, our physical senses are like windows. Windows let us see out of a house, but the number of windows in the house and the direction they face determine what we can see of the neighborhood around. Similiarly, what senses we have and the range of their sensitivity determine what we can perceive of the world. There is more to reality than we can observe through our usual sense-windows. And that is true of all of our bodies ?all of our interfaces with the many environments in which we live. As Hamlet told his friend, "There are more things in heaven and earth, Horatio, ?Than are dreamt of in your philosophy."