Verse 7

7. Meditating on the highest Lord,  The Absolute,  and tranquil,  the holy man reaches Him who is the source of all,  the witness of all and is beyond darkness and delusion.

"Meditating on the highest Lord,  The Absolute"

The meditating sage reaches the highest through an open heart Alone.  Such Realised Sages have reported back on the reality of the Absolute but that Absolute itself is unknowable.  The love of an open heart will through grace receive the knowledge of the Absolute but that Absolute will not be found through acquired knowledge or description,  This should be realised.

"tranquil,  the holy man reaches Him who is the source of all,  the witness of all"

 

If the Sage were to look back he would see a past life of negotiating a path through the unreal and the untrue.  Here now in the tranquillity of renunciation,  meditating at the feet of the Absolute he has transcended the unreal and has found his way home to the Absolute "source of all,  the (unmoving) witness of all".

"and is beyond darkness and delusion"

Having once transcended the untruth and delusion of duality one will have seen the light of the Knowledge of Non-Duality.  Once the light of Truth is seen this One Alone is forever beyond the darkness of ignorance.

Understanding that the Absolute source of all is a singularity the sage reaches that singularity through Realising his own identity as that Solitary singularity.