Vishnu sahastsnamam, sloka19

Vishnu Sloka19:    Mahabuddhir Mahaveerho  Mahasaktir  MahaDyuthihi
                    AnirDesyavapuhu  Sreemaan  Ameyaatma   MahaDridhruth

The great Intellect,  the great Valiant,  the great Energy,  the great devine Light,   the Omnipresent  ( not restricting to any one place )and the Ancient, 
the  highly Honourable, the Incomparable Atma , the strongest, alike mountain,  is 
Sri Maha VISHNU.

Anirdesya + va+ puhuu=  undefinable + and + ancient

The Devine Light of thousands of Suns, with incomparable  quantums of Energies  and  Strength is Vishnu.  Vishnu is  existing from time immemorable,  everywhere spreading the Intelligence in the form of LIGHT. The same attributes are given to Paramatma,  in Bhagavad gita too.

                 Om Vishnave namahax