Philosophical knowledge is the knowledge gained by reason from concepts ; mathematical knowledge is the knowledge gained by reason from the construction of concepts.
The Bhagavad-Gita is an empire of thought and in its philosophical teachings Krishna has all the attributes of the full-fledged montheistic deity and at the same time the attributes of the Upanisadic absolute.
And I entered and beheld with the eye of my soul... the Light Unchangeable... He that knows the Truth, knows what that Light is; and he that knows It, knows Eternity.