आत्मनस्तत्प्रकाशत्वं यत्पदार्थावभासनम् ।नाग्न्यादिदीप्तिवद्दीप्तिर्भवत्यान्ध्यं यतो निशि ॥ २२ ॥
In plain words
The Self's own light is this: it is what makes objects appear at all. Its radiance is not the radiance of fire or lamp — because at night, with those burning, there is still blindness.
Close to the Sanskrit
Of the Ātman, that self-luminosity is that which is the making-manifest of objects. It is not a radiance like the shining of fire and the rest, since at night there is blindness.