śrī-rudra uvāca
tvaḿ hi brahma paraḿ jyotir
gūḍhaḿ brahmaṇi vāń-maye
yaḿ paśyanty amalātmāna
ākāśam iva kevalam
sri-rudrah uvaca -- Lord Siva said; tvam -- You; hi -- alone; brahma -- the Absolute Truth; param -- supreme; jyotih -- light; gudham -- hidden; brahmani -- in the Absolute; vak-maye -- in its form of language (the Vedas); yam -- whom; pasyanti -- they see; amala -- spotless; atmanah -- whose hearts; akasam -- the sky; iva -- like; kevalam -- pure.
The Absolute Truth is the source of all light and is therefore the supreme light, self-luminous. This Absolute Truth is explained confidentially in the Vedas and is therefore difficult for an ordinary reader to understand. The following statements quoted by Srila Jiva Gosvami from the Gopala-tapani Upanishad show how the Vedic sounds occasionally reveal the Absolute: Te hocur upasanam etasya paratmano govindasyakhiladharino bruhi (Purva-khanda 17): "They [the four Kumaras] said [to Brahma], 'Please tell us how to worship Govinda, the Supreme Soul and the foundation of all that exists.' " Cetanas cetananam (Purva-khanda 21): "He is the chief of all living beings." And tam ha devam atma-vritti-prakasam (Purva-khanda 23): "One realizes that Supreme Godhead by first realizing one's own self." The great acarya Jiva Gosvami also quotes a verse from the Srimad-Bhagavatam (7.10.48) -- gudham param brahma manushya-lingam -- which refers to "the Supreme Truth concealed in a humanlike form."
Since the Lord is pure, why do some people perceive Krishna's form and activities as impure? Acarya Jiva explains that those whose own hearts are impure cannot understand the pure Lord. Srila Visvanatha Cakravarti further quotes the Lord's own instruction to Arjuna in Sri Hari-vamsa:
tat-param paramam brahma
sarvam vibhajate jagat
mamaiva tad ghanam tejo
jnatum arhasi bharata
"Superior to that [total material nature] is the Supreme Brahman, from which this entire creation expands. O descendant of Bharata, you should know that the Supreme Brahman consists of My concentrated effulgence."
Thus, to save his devotee, Siva now glorifies the Supreme Lord, Krishna, his eternal worshipable master. The Lord's bewildering potency induced Siva to fight with Lord Krishna, but now the fight is over, and to save his devotee Lord Siva offers these beautiful prayers.