Also this is said to be
the light of lights
That is beyond darkness:
It is knowledge,
the object of knowledge
and That which is to be
attained through knowledge.
 
It is seated in the hearts of all...
For I am the fountain of Brahman,
Of the Immortal and the Imperishable.
And of everlasting virtue,
And of absolute bliss.
 
                     (Sri Krishna, Bhagavad Gita)