तपाम्यहमहं वर्षं निगृह्णाम्युत्सृजामि च।अमृतं चैव मृत्युश्च सदसच्चाहमर्जुन ॥

I radiate heat in the form of the sun. I send forth the rain in the form of Indra in the rainy season and I take it back during the rest of the year.Sat Existence, the manifested world (the effect).Asat Nonexistence, the unmanifested (the cause).Nonexistence does not mean nothingness. The subtle, unmanifested cause is spoken of as nonexitence. The Self or Brahman or the Eternal can never be altogether nonexistence. It always exists. It is Existence Absolute. If you say that the subtle unmanifested cause is nothing, it is impossible to conceive existence coming out of nothing. The Chhandogya Upanishad asks, How can existence come out of nonexistence It is simply absurd to conceive that existence has arisen out of nonexistence (nothing).For a Vedantin ( student or follower of Vedanta) Brahman (the Absolute) is Sat (existence) because It always exists and because It is unchanging. This manifested world is Asat or unreal. For the worldlyminded people who have neither understanding nor knowledge of Brahman, who are endowed with gross and impure mind, who do not have a sharp and subtle intellect, and who ca perceive the gross forms only, this manifested world is the Sat and the subtle unmanifested MulaPrakriti (the primordial Nature), the cause of this manifested world, is Asat. For them Brahman also is Asat