Srimad Bhagavad-Gita :
Chapter-13. ( Kshetra-kshetrajna-vibhaga-yogam )
Slokam-13. ( I shall now explain the knowable, knowing which you will taste the eternal. This is beginning-less, and it is subordinate to Me. It is called Brahmam, the spirit, and it lies beyond the cause and effect of this material world.)
jneyam yat tat pravakshyami yatjnatvamrtamasnute,
anadimat param brahma na sat tannasaducyate.
jneyam yat = (which ) the one which is to be known ( knowledge );
yat jnatva = ( if ) that one is known ( knowing that knowledge );
amrtam asnute = results in gaining amrtatvm;
tat pravakshyami = that I will tell ( teach ) you;
anadimat param brahma = that is the beginningless Para-brahmam ( the Supreme abode ) ;
tat sat na asat na = that either sat ( cause ) or asat ( effect );
ucyate = cannot be said ( called ).
Lord Krishna is declaring that which is most worthy to be known is that which is most worthy to strive for and be gained and that is realisation of the atma or immortal soul. This realisation is attained by imbibing the 20 attributes heretofore mentioned previously. Here the word amritam meaning nectar denotes the nectar of immortality and refers directly the immortal soul exempt from the pangs of birth, decrepitude and death.
Anadi means that which has no beginning for as the atma has no birth it has no ending and is eternal. The Katha Upanisad I.II.XVIII beginning najayate mriyate va vipascit means that the atma is without birth and death. The compound mat- param clarifies that the atma is both a part of the Supreme Lord who is present within as paramatma the Supreme Soul and always subordinate to Him.
The Svetasvatara Upanisad VI.IX beginning sakaranam karana dhipa dhipo means: The Supreme Lord is the cause of all causes and the lord of the lord of the senses for Him there is no Lord or progenitor. Further in the same chapter VI.XVI beginning pradhana ksetrajna patir gunesah meaning: The Supreme Lord who is endowed with all auspicious qualities is the lord of the field of activities, the knower of the field of activities.
To be continued ...