। ॥ ८९९ ॥
In plain words
Dissolved in the sweet immersion of supreme bliss and fused into oneness with that very Self, the utterly still state of the mind is known as non-conceptual samadhi.
Close to the Sanskrit
Arising from absorption in the essence of the bliss of Brahman, having become one through that Self, that which is the motionless state of the mental modification is that non-conceptual samadhi.