Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.
The perception of other people and the intersubjective world is problematic only for adults. The child lives in a world which he unhesitatingly believes accessible to all around him. He has no awares of himself or of others as private subjectives, nor does he suspect that all of us, himself included, are limited to one certain point of view of the world. That is why he subjects neither his thoughts, in which he believes as they present themselves, to any sort of criticism. He has no knowledge of points of view. For him men are empty heads turned towards one single, self-evident world where everything takes place, even dreams, which are, he thinks, in his room, and even thinking, since it is not distinct from words.
The relation to the other is not epistemological, but ethical, and the whole attempt to accomodate or account for the other within the confines of my experience already constitutes a breach of this fundamental ethical relation. The other is precisely that which cannot be the object of my experience in the sense of being completely manifest within it, and so cannot be construed as a phenomenon at all.
The number two, he thought, was an ominous number. Two is a reflection or duplication of one, the most perfect of the natural numbers. Two is all echo and counterpoise; two is the beginning of multiplicity, the way the universal oneness differentiates itself and breaks apart into strings and quarks and photons, all the separate and component pieces of life. Two is a symbol of becoming as opposed to pure being...