First there is a mountain, then I am the mountain, then the mountain is appearing in That I Am. Life is just an illusive interruption from awareness for the purposes of self-awareness.
It’s not that existence is nothing, my nihilistic friend, but that existence as a dream state is nothing when compared to the sat (being, existence, presence) of satcitananda, aka parabrahman.
So in the mountainous world of doing, ego decides, the intellect rationalizes this decision, and the mind veils the inconvenient facts while projecting all the others.
In the valley of nondoing, the mind supplies objective information clearly, the intellect intuitively decides the necessary action intelligently, and ego carries out the operation intently without an eye for its end.