BG 15.12

15.12 यत् which? आदित्यगतम् residing in the sun? तेजः light? जगत् the world? भासयते illumines? अखिलम् whole? यत् which? चन्द्रमसि in the moon? यत् which? च and? अग्नौ in the fire? तत् that? तेजः light? विद्धि know? मामकम् Mine.Commentary The immanence of the Lord as the allilluminating light of consciousness is described in this verse.I am the cause and the source of the light by which the sun illumines the world? as also the reflected light of the sun in the moon and that of fire.Tejah Light The light of consciousness.If that is so? an objector says The light of consciousness exists alike in all moving and unmoving objects. Then why has the Lord mentioned this special alification of light as residing in the sun? moon and fire Please explain. We say The higher manifestation of the light of consciousness in the sun? etc.? is due to a large concentration of Sattva in them. Sattva is very brilliant and luminous in them. That is the reason why there is this special alification.Here is an illustration. The face of a man is not at all reflected on a wall? piece of wood or a block of stone? but the same face is reflected beautifully in a very clean mirror. The degree of clearness of the reflection in the mirror is acording to the degree of transparency of the mirror. The more the transparency of the mirror? the better the reflection of the face the less the transparency? the worse the reflection. Even so Gods light shines in the sun and also in the pure heart of a devotee.

— vedicscriptures · exposition · source ↗

The unintelligent cannot understand how things are taking place. But one can begin to be established in knowledge by understanding what the Lord explains here. Everyone sees the sun, moon, fire and electricity. One should simply try to understand that the splendor of the sun, the splendor of the moon, and the splendor of electricity or fire are coming from the Supreme Personality of Godhead. In such a conception of life, the beginning of Kṛṣṇa consciousness, lies a great deal of advancement for the conditioned soul in this material world. The living entities are essentially the parts and parcels of the Supreme Lord, and He is giving herewith the hint how they can come back to Godhead, back to home. From this verse we can understand that the sun is illuminating the whole solar system. There are different universes and solar systems, and there are different suns, moons and planets also, but in each universe there is only one sun. As stated in Bhagavad-gītā (10.21) , the moon is one of the stars ( nakṣatrāṇām ahaṁ śaśī ). Sunlight is due to the spiritual effulgence in the spiritual sky of the Supreme Lord. With the rise of the sun, the activities of human beings are set up. They set fire to prepare their foodstuff, they set fire to start the factories, etc. So many things are done with the help of fire. Therefore sunrise, fire and moonlight are so pleasing to the living entities. Without their help no living entity can live. So if one can understand that the light and splendor of the sun, moon and fire are emanating from the Supreme Personality of Godhead, Kṛṣṇa, then one’s Kṛṣṇa consciousness will begin. By the moonshine, all the vegetables are nourished. The moonshine is so pleasing that people can easily understand that they are living by the mercy of the Supreme Personality of Godhead, Kṛṣṇa. Without His mercy there cannot be sun, without His mercy there cannot be moon, and without His mercy there cannot be fire, and without the help of sun, moon and fire, no one can live. These are some thoughts to provoke Kṛṣṇa consciousness in the conditioned soul.

— vedicscriptures · exposition · source ↗