“Humanity is not an aggregate of individuals, a community of thinkers, each of whom is guaranteed from the outset to be able to reach agreement with the others because all participate in the same thinking essence. Nor, of course, is it a single Being in which the multiplicity of individuals are dissolved and into which these individuals are destined to be reabsorbed. As a matter of principle, humanity is precarious: each person can only believe what he recognizes to be true internally and, at the same time, nobody thinks or makes up his mind without already being caught up in certain relationships with others, which leads him to opt for a particular set of opinions. Everyone is alone and yet nobody can do without other people, not just because they are useful (which is not in dispute here) but also when it comes to happiness.”

“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.”

“All thought of something is at the same time self-consciousness [...] At the root of all our experiences and all our reflections, we find [...] a being which immediately recognises itself, [...] and which knows its own existence, not by observation and as a given fact, nor by inference from any idea of itself, but through direct contact with that existence. Self-consciousness is the very being of mind in action.”

“Being established in my life, buttressed by my thinking nature, fastened down in this transcendental field which was opened for me by my first perception, and in which all absence is merely the obverse of a presence, all silence a modality of the being of sound, I enjoy a sort of ubiquity and theoretical eternity, I feel destined to move in a flow of endless life, neither the beginning nor the end of which I can experience in thought, since it is my living self who think of them, and since thus my life always precedes and survives itself.”

“It is no more natural and no less conventional to shout in anger or to kiss in love than to call a table 'a table'. Feelings and passional conduct are invented like words. Even those which like paternity seem to be part and parcel of the human make-up are in reality institutions. It is impossible to superimpose on man a lower layer of behavior which one chooses to call 'natural' followed by a manufactured cultural or spiritual world. Everything is both manufactured and natural in man as it were in the sense that there is not a word, not a form of behavior which does not owe something to purely biological being and which at the same time does not elude the simplicity of animal life and cause forms of vital behavior to deviate from their pre-ordained direction through a sort of leakage and through a genius for ambiguity which might serve to define man.”

“But the spectacle perceived does not partake of pure being. Taken exactly as I see it, it is a moment of my individual history, and since sensation is a reconstitution, it pre-supposes in me sediments left behind by some previous constitution, so that I am, as a sentient subject, a repository stocked with natural powers at which I am the first to be filled with wonder.”

“The thing can never be separated from someone who perceives it; nor can it ever actually be in itself because its articulations are the very ones of our existence, and because it is posited at the end of a gaze or at the conclusion of a sensory exploration that invests it with humanity. To taking up or the achievement by us of an alien intention or inversely the accomplishment beyond our perceptual powers and as a coupling of our body wit the things.”