Here is Sayana's commentary:


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Brahma Satyam Jagan Mithya Jeevo Brahmaiva Na Parah





Regarding Speed of Light:
There are 2 quotes. I will try to reproduce as given in the book:
taraNirvishvadarshato jyotiShk^Ridasi sUrya | vishvamAbhAsi rochanam |
Oh Sun! (You) overwhelm all in speed, visible to all, source of light. (You) shine pervading the Universe.
tathA cha smaryata yojanAnAM sahasram dve dve shate dve cha yojane | ekena nimiShArdhena kramamANa namo&stu te ||
It is remembered (that) Salutations to Thee (sun), the traveller of 2.202 yojanas in half a nimiSha.
Source:
Rg-veda-samhitA, maNDalam 1, sUktam 50, mantraH 4 (6000 DCE) sAyanAchArya's commentary (14th century AD)
Concluding His commentary on 15th chapter of Gita, here is what Madhusudana Sarawathi has to say:
vaMshiivibhUshhitakaraannavaniiradaabhaatpiitaambaraadaruNabimbaphalaadharoshhTh
at.h
|
pUrNedusundaramukhaadaravindanetraatkR^iShNaatparaM kimapi tattvamahaM na jaane
||
I do not know any reality other than krishna whose hands are adorned with a flute, whose lustre is like that of a rain-cloud, who wears a yellow cloth, whose lips are reddish like the Bimba-fruit, whose face is beautiful like the full moon, and whose eyes are like lotuses.
sadaa sadaanandapade nimagnaM mano manobhaavamapaakaroti |
gataagataayaasamapaasya sadhaH paraaparaatiitamupaiti tatvam.h ||
The mind that is ever merged in the state of constant Bliss removes (all) mentations, (and) by eradicating the sorrows consequent on (repeated) births and deaths it attains at once the Reality transcending cause and effect.
shaivaH saurashcha gaaNeshaa vaishhNavaaH shaktipUjakaaH |
bhavanti yanmayaaH sarve sohamasmi paraH shivaH ||
I am that supreme Auspicious One in whom get identified all the followers of Shiva, of the Sun, of Ganesha, of Vishnu, and the worshippers of Shakti.
Madhusudana Sarasvati, who was a great devotee of Krishna and also a great advaitin, has, in the above shloka, first described Krishna and then identified him with the supreme brahman.
Another great devotee-poet, Narayana Bhattatiri, has, in the first shloka of his great work nArAyaNIyam, done the opposite. He has first described the supreme brahman and then identified it with Krishna, the Lord of GuruvAyUr. The shloka is given below:
sAndrAnandAvabodhAtmakam anupamitam kAladeshAvadhibhyAm
nirmuktam nityamuktam nigamashatasahasreNa nirbhAsyamAnam |
aspaShTam dRiShTamAtre punarurupuruSharthAtmakam brahma tattvam
tat tAvat bhAti sAkShAt gurupavanapure hanta bhAgyam janAnAm ||
Translation:--
Brahman, which is pure Existence-Consciousness-Bliss, which is without parallel, which is absolutely free from the limitations of time and space, which is always free from the control of mAyA, which is very well explained by innumerable statements in the upaniShads, but is yet not clearly grasped (by a mere study of the upaniShads), but the realization of whose identity with one's own self is what constitutes the highest puruShArtha, namely, liberation from the cycle of birth and death; that very Brahman is present in concrete form in the temple of GuruvAyUr (in the form of Lord Krishna). This is indeed a great good fortune for the people.
The above shloka contains the essence of all the upaniShads.