The body we inhabit, and nature that is all around our body, is tangible (sa-guna). What resides in our body, and in nature, is not (nir-guna). Deha and prakriti are within the reach of the senses; they are bound by the rules of space and time, which means that they can be measured and are impermanent. Dehi and purusha, however, are outside the reach of the senses, and are not bound by rules of space and time, which means that they cannot be measured and are permanent.
