Nimittopadan Karan (निमित्तोपादान कारण)
The instrumental and material cause of creation, explaining how Shri Krishna is both its maker and its substance.
Nimittopadan Karan (निमित्तोपादान कारण | nimittopādāna kāraṇa) means both the instrumental cause and the material cause of creation.
Nimitta Karan is the cause responsible for bringing something into existence, while Upadan Karan is the material from which it is made.
For example, a potter is the instrumental cause of a clay pot, while clay is its material cause.
Shri Krishna is both causes. He Himself manifests as the material world in the form of Savaran Brahm, where, even though He is Bliss, that Bliss is veiled.
Shri Krishna is also Nimittopadan Karan of His divine realm, where He manifests as Niravaran Brahm, with His Bliss unveiled. Thus, even a speck of dust in that realm bestows the same ecstasy as embracing Shri Krishna.
Go Deeper

Why does touching even a speck of dust in Golok bestow the same ecstasy as embracing Shri Krishna?
