Except in one or two trivial details, where I have the warrant of old friendship, I have not, without permission, quoted conversation or described occurrence from the private life of named or recognisable persons. I have not felt my freedom abated, for most of the friends of my youth are dead and over the dead I have an historianís rights. They were artists and writers and certain among them men of genius, and the life of a man of genius, because of his greater sincerity, is often an experiment that needs analysis and record. At least my generation so valued personality that it thought so. I have said all the good I know and all the evil: I have kept nothing back necessary to understanding.