When it was published in 1878, Human, too human, left readers perplexed: we do not recognize the author of The Birth of Tragedy. Yet, the break between the two works is not as radical as we wanted to think. Rather, it is a profound and decisive self-assertion movement that manifests itself in this new book. Freed from his past influences, Nietzsche reinvests his questions on a new mode and, in doing so, consolidates his own way of philosopher. The most striking evolution is stylistic: Nietzsche adopts for the first time the aphoristic form, conforming to his thought, anti-dogmatic, which proceeds by tests, hypotheses, multiplication of points of view. Hence a change in methodology: down from philosophical tradition, he rejects the fixedist perspectives of metaphysics and advocates an interpretative logic. Placing himself on the field of psychology, he investigates the meanderings of the human soul, recognizing that everything that happens in reality is not entirely attributable to reason, but much more to inconscient processes – instincts, impulses, values – which constitute the "too human" of the human.