The Lord milked the cows ( Upanishads ) and created a master treatise, the Geetha. The Geetha is the Lamp lit by Him at the altar of humanity. It is the Upanishad sung by Him, the Science of the Absolute and the Scripture on Yoga.
In the Upanishads, Reality is indicated by a series of negatives, because the Negative is less limiting than the Positive.
Aurobindo wrote ” The ancient sages spoke indeed of Brahman negatively. They said It is not this, It is not that”. At the same time, they took care to speak of it positively. They said It is this, It is that, It is all. Brahman, the Absolute, they said is Life, is Matter, is Life, is Supermind, is Cosmic Delight, is Sat Chit Ananda ( Being, Knowledge, Bliss ). But Brahman, the Absolute, cannot be defined by any of these terms, not even by our broadest definition of Sat Chit Ananda”.