स एष रसानाँ रसतमः परमः परार्ध्योऽष्टमो यदुद्गीतः ।३।
sa eSha rasAnA~M rasatamaH paramaH parArdhyo&ShTamo yadudgItaH |3|
This udgIta is the essense of the essences! Supreme!
Highest goal! The eight fold!
1. rasAnA~M rasatamaH
PraNava or UdgIta is the essence of everything, as explained in the
previous verse of this upanishad.
2. ardhya - to be accomplished.
udgIta is the one that stands in the eight things.
The eight things are - earth, water, fire, air, space, sun, moon
and soul. God is resident in all these eight. Hence Lord
shiva is hailed as "aShTa mUrti".
Appar refers to this eightfold forms of the Lord