। ॥ १२९ ॥
In plain words
This is the one who sees everything, and whom nothing else can ever see. This is the light that makes the mind and its thoughts conscious -- while the mind, for all its brightness, can never turn around and light this up in return.
Close to the Sanskrit
This is he who himself sees everything, whom nothing sees; who illumines the intellect and so on, whom that intellect does not illumine.