What is Brahman?

Brahman cannot be defined because it is infinite. It is beyond thought and beyond imagination. It is nothing in the mind and nothing outside the mind,nothing past or present or future. These are only conceptions in time and space. But the nearest conecption of Brahman we can have is to say that it is a state of conciousness beyond time when SAT, CHIT and ANANDA, being, conciousness and joy, are one - modern translation of the Upanishads.