The power of the feeling is the gathering which edifies, the being seized by oneself, its blazing up, its fulguration, is the becoming of the being, … - Michel Henry

Because practice is subjective, theory which is always the theory of an object, can't access to the reality of this practice, what it is in itself, but only represent it, in such a way that this representation lets out of itself the real being of practice, the effectivity of the doing. Theory does nothing.

Let us consider a biology student who is reading a work about the genetic code. The student’s reading is the repetition through an act of her own consciousness of the complex processes of conceptualization and theorizing contained in the book, or those that are signified by the printed characters. But, in order for this reading to be possible, the student must turn the pages with her hands as she reads. The student must move her eyes in order to cover it and collect the lines of the text one after the other. When the student becomes tired, she will get up, leave the library, and take the stairs to the cafeteria where she will get some rest and something to eat and drink. The knowledge contained in the biology manual that was assimilated by the student during her reading is scientific knowledge. […] The knowledge that made possible de movements of the hands and the eyes, the act of getting up, climbing the stairs, drinking and eating, and resting is the knowledge of life.

From these brief preliminary indications it follows that the concept of truth is twofold, designating both what shows itself and the fact of self-showing. What shows itself is the gray sky or the equality of radii in a circle. But the fact of something showing itself has nothing to do with what shows itself, with the gray of the sky or with geometric properties, and is even totally indifferent to what shows itself. The proof of this is that a blue sky can show itself to us as well, just as geometric properties, other forms, or even the fury of peoples killing each other, the beauty of a painting, the smile of a child. The fact of self-showing is as indifferent to what shows itself as the light to what it illuminates – shining, according to Scripture, on the just as well as the unjust. But the fact of self-showing is indifferent to all that shows itself only because by its nature it differs from all that, whether it may be: clouds, geometric properties, fury, a smile. The fact of self-showing, considered in itself and as such – that is the essence of truth.