Livets Bog, vol. 3
The I as an answer that cannot be expressed in terms of weights and measures. The ability to experience as a subordinate characteristic
687. Regarding the I, we have already arrived at an answer that does not exist as identical to a degree of effect and can therefore be expressed in no case whatsoever in terms of weights or measures. It represents in itself neither a solid, fluid, gaseous or spiritual state and it is therefore, from the point of view of purely materialistic research, equivalent to nothing. And we would be forced to agree with the materialistic researcher when he maintains that it does not exist, were it not for the fact that all existing energies in their cooperation in the form of Nature, in the form of the appearance of our fellow beings, in the form of our own organism, resulted in a realisation of our own unfailing faculty to experience. We can never deny that this faculty to experience – which in turn can exist only as the most fundamental reality in every living being and as the most tangible fact to every terrestrial human being as well as to beings on even higher levels of evolution – is a subordinate characteristic.
      But to whom is it subordinate? It must be subordinate to the reality or the "something" that experiences through it. To deny that there is "something" that uses it, would be the same as going against the very fact that our own experience of life in itself constitutes.
Symbol by Martinus
Symbol no. 11
The Solution to the Mystery of Life