Never have I experienced the difficulty of addressing women and men together as I have in writing this book. How do I speak to you at the same time, my female and male readers? I know several of you, I dialogue with some of you, and I am not unaware of the joys and even the difficulties of our exchanges. I long for these exchanges because of what they reveal to me, their discoveries, but also their opacities or nights. I want them for their resources and the affective asceses which they bring with them. But this is the first time that I feel so intensely the difficulty of addressing myself to you, women and men, with the same words.