The mind, in which is the brain, the thoughts, the feelings, and any subtle emotion or fantasy, is, according to the Buddhists, an extraordinary thing.
All its content doesn´t create the mind, and yet without them the mind is not.
The mind is more than what it contains.
Without the mind the contents would not be; without the emptiness in the nature of the mind, there can´t be content, just like that it is the emptiness in a pot, which makes possible, that it can contain water.
The contents exist because of the emptiness.
The intellect - the thoughts, the feelings, all consciousness - have their existence in the total emptiness of the mind.
A tree is not the word, nor a leaf, branches or roots; the wholeness of them is the tree and yet the tree is none of these things.