Srimad Bhagavad-Gita :
Chapter-12. ( Bhakti-yogam )
Knowledge of the prodigious manifold forms of the Supreme Lord, His manifold expansions, His manifold incarnations, His visvarupa or divine universal form and the unlimited lilas or pastimes of them all begins the revelation that Lord Krishna is the immortal, eternal Lord of all lords, from whom everything emanates in existence and to whom all paths return back to Him.
In the Sama Veda, Saukarayana section we find that Rudra the mind born son of Brahma approaches him and asks to know who is verily the ultimate goal of all existence, the eternally established, creator of all beings who bestows moksa or liberation upon the aspirants, the righteous and the noble.
How does one meditate upon such a Supreme Being and how can one meditate upon a Supreme Being who is completely spiritual without any material qualities or attributes?
Brahma replied it is verily the Supreme Lord Krishna who is the ultimate goal as well as the object of meditation by the aspirants and the granter of moksham.
Of unlimited avatars or incarnations, expansions and manifestations, appearing in many colours surrounded by a golden hue.
He verily is shining like the sun and should be meditated upon within the heart as a personality resembling a human the colour of a radiant dark blue sapphire with gentle smile and hands giving blessing surrounded by a golden hue.
He is camouflaged by the brahmam the spiritual substratum pervading all existence and which emanates an impenetrable dazzling light throughout all creation which effectively covers His all pervading form.
It is for this reason that He is also propitiates as avyaktam or immutable and aksaram or unmanifest because He cannot be perceived by material vision.
To be continued ...