Fiftieth technique. Contemplation of the indestructible within the body. Śarīre svaguṇānvitam — in the body, with all its qualities. Sūkṣmasūkṣmatarātmakam — subtler and subtler. Layer after layer. From skin to muscle, from muscle to bone, from bone to marrow, from marrow to energy, from energy to consciousness.

Tasya yad dravyam — that substance. Tatkṣaye kṣayavān na saḥ — when that perishes, it does not perish. What remains when all layers of body dissolve? What remains cannot die because it was never born. It is the witness-consciousness.

This technique can be practiced literally: contemplate your body layer by layer, from gross to subtle, asking at each level “am I this?” When you reach something that cannot be removed, you have found the real.