My Dear Brother!
You want an explanation of the Unity of Existence. In one of the Flashes of the Thirty-First Letter there is a very powerful and elucidating answer to Muhyiddin’s ideas concerning this matter. For now we just say the following:
Teaching this question of the Unity of Existence to people at the present time causes serious harm. Like when metaphors and similes pass from the hands of the learned to those of the common people and knowledge passes from scholars to the ignorant, they are thought to be literally true,1 so when elevated truths such as the Unity of Existence pass to the heedless and to the common people submerged in causes, they are thought to be Nature, and cause three significant instances of harm.
T h e F i r s t : The way of the Unity of Existence is quite simply to deny the universe on account of Almighty God. Despite this, when it is adopted by the heedless common people and enters their ideas which are tainted by materialist thought in particular, it leads to denial of the Godhead on account of the universe and materiality.
Just like the two angels, called the Bull and the Fish in connection with certain metaphors, were supposed by the common people to be a vast bull and enormous fish.