॥ १२ ॥ । । ॥ १३९ ॥
In plain words
[Chapter Twelve: Self-Luminosity.] The sun, the moon, fire, a lamp — these light up both themselves and everything else. And yet, not one of them can ever light up the Self.
Close to the Sanskrit
[Chapter 12: The Chapter on Self-luminosity.] Sun, moon, fire, lamp, and the like, may be illuminators of both self and other; even so, the Self is indeed never illuminated by these, anywhere.