This is a brief sub-gloss. For a fuller reading of this verse, see Madhusūdana, Śaṅkara, or Rāmānuja above.
As a man in the world casts off worn-out clothes, ones that have grown weak, and takes up new ones, so the embodied Self casts off worn-out bodies and goes to others, new ones, while itself remaining changeless, like the man. Why is it changeless? He says.
Contemporary English rendering of the Sanskrit bhāṣya, pending scholar review.