Is it possible to recover the lost teachings on the significance of the body or to reconstruct them from the existing fragments?
There is no need for that. All spiritual teachings originate from the same Source. In that sense, there is and always has been only one master, who manifests in many different forms. I am that master, and so are you, once you are able to access the Source within. And the way to it is through the inner body. Although all spiritual teachings originate from the same Source, once they become verbalized and written down they are obviously no more than collections of words - and a word is nothing but a signpost, as we talked about earlier. All such teachings are signposts pointing the way back to the Source.
I have already spoken of the Truth that is hidden within your body, but I will summarize for you again the lost teachings of the masters - so here is another signpost. Please endeavor to feel your inner body as you read or listen.
What you perceive as a dense physical structure called the body, which is subject to disease, old age, and death, is not ultimately real - is not you. It is a misperception of your essential reality that is beyond birth and death, and is due to the limitations of your mind, which, having lost touch with Being, creates the body as evidence of its illusory belief in separation and to justify its state of fear. But do not turn away from the body, for within that symbol of impermanence, limitation, and death that you perceive as the illusory creation of your mind is concealed the splendor of your essential and immortal reality. Do not turn your attention elsewhere in your search for the Truth, for it is nowhere else to be found but within your body.
Do not fight against the body, for in doing so you are fighting against your own reality. You are your body. The body that you can see and touch is only a thin illusory veil. Underneath it lies the invisible inner body, the doorway into Being, into Life Unmanifested. Through the inner body, you are inseparably connected to this unmanifested One Life - birthless, deathless, eternally present. Through the inner body, you are forever one with God.