 For this alone is fitting for a philosopher. We have no right to be single in anything: we may neither err nor hit upon the truth singly. Rather, with the necessity with which a tree bears its fruit our thoughts grow out of us, our values, our yes’s and no’s and if’s and whether’s—the whole lot related and connected among themselves, witnesses to one will, one health, one earthly kingdom, one sun. (GM Pref., 2)