The ‘I’ in philosophy is the principle of subjectivity, thinking activities to which has been often attributed a particular value because it is the hub from which the same philosophical reflection comes out. The concept of 'I' in fact corresponds to the moment when ‘the thinking’ and ‘the thought’ were the same reality as the thought: when ‘I’ reflect on me, subject and object coincide and no longer have a connotation that differentiates them.

It seems fair to me to say that the subjectivity of the subject resolves entirely in the presence of the object. Subject and object are two distinct concepts but not separable, since ‘the one’ is such, thanks to the presence of the other.

For space reason, I can refer to only a part of the vast and ‘dense’ literature.

The intellectual intuition was first revalued by Fichte and Schelling, according to whom it was a superior and a priori form of thought than the logical-dialectical one, not ‘objectifiable’, otherwise it would mean making objective what is subjective, which is a logical contradiction. As it cannot be proven, it should be placed as an act of faith, which - nonetheless - is not irrational, being transcendental or founding rationality itself.

Starting from Heidegger, Levinas calls into question the primacy of the problem of ‘being’, dominated by the principle of totality, to look in the appeal of ‘alterity’ the foundation of authentic subjectivity.

Husserl introduced the method of phenomenological reduction, which proceeds through the epoché and the transcendental reduction not to suspend judgment on the existence of the world, but also to bring it back to the subjectivity, pure or absolute.

To the construction of the whole edifice of knowledge, to the certainty of a pure, but singular Ego, it occurred the awareness that is constitutive of ego, its relationship with the ‘other’ and that subjectivity and inter-subjectivity be inextricably linked.

Andrea Altobrando, Research Fellow at the Hokkaido University of Sapporo (Japan) writes in the publication entitled: "Husserl and the problem of the monad":

“the proposal of a ‘monadology’ and a relative monadologic conception made by Husserl, has given rise to interpretations, reflections and criticisms that have first insisted on the fact that, in the Husserl perspective, the Monad "has windows", and it has been intended to highlight the significance in relation to the issues of inter-subjectivity. Much less has been investigated on what is "inside" the space that windows would delimit and how it is organized. Little attention has generally been devoted to what consequences stem from the conception of subjectivity as a monad "on this side" of its possible ways of communication.

The rupture of the totality is represented by human subjectivity, redefined by Levinas in the face that expresses the mystery of the subject. Society will be based on an inter-subjective relationship that does not abolish ‘the other’, but respects the mystery. The ‘other’ is subjectivity that transcends the totality.

Jaspers, referring to the words of Aristotle ("soul is, in a sense, everything"), underlined the need to recover that consciousness of the reciprocal relationship subject / object from which science has set out, which assumed to be able to leave out subjectivity.

The return of self consciousness means, at a first time, to experience the void of external objects, uncovering as self-consciousness. In a second time, to overcome the subjective or inadequate representations of self-consciousness and to discover to be objective self-consciousness. Finally, to get over the immediate and unconscious form of this actuality to achieve the self-conscious union of objective self-consciousness and subjective substance.

Sartre recognizes to man an absolute and unconditional freedom, which is expressed in dialectical form, whose subjectivity is dependent on socio-environmental objectivity as its "field of possibilities": a freedom thus become conditioned because is in relation to a large background of need.

The foregoing and partial summary, limited due to space, seems it could give a first test of the variety of thought on subjectivity. It is up to the reader of this note to judge whether there is a common ground among scholars of different trends and vocational training.

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