Joyful Wisdom: this is the serenity of recognition from the insight that seriousness is part of recognition and at the same time limits it; it is the experience of the whole in the possible, the matter of free spirits. In this sense, Nietzsche addresses philosophy and science, art, religion, and morality. Alongside Nietzsche's confession to "amor fati," we also find the first articulation of the idea of the eternal recurrence of the same. The "Joyful Wisdom": perhaps the clearest philosophical book of modernity.