Routledge, 2004. — 1025 p. — ISBN 0-203-48797-4
A few words of apology and explanation are called for if this book is to escape even more severe censure than it doubtless deserves. Apology is due to the specialists on various schools and individual philosophers. With the possible exception of Leibniz, every philosopher of whom I treat is better known to some others than to me. If, however, books covering a wide field are to be written at all, it is inevitable, since we are not immortal, that those who write such books should spend less time on any one part than can be spent by a man who concentrates on a single author or a brief period. Some, whose scholarly austerity is unbending, will conclude that books
covering a wide field should not be written at all, or, if written, should consist of monographs by a multitude of authors. There is, however, something lost when many authors co-operate. If there is any unity in the movement of history, if there is any intimate relation between what goes before and what comes later, it is necessary, for setting this forth, that earlier and later periods should be synthesized in a single mind. The student of Rousseau may have difficulty in doing justice to his connection with the Sparta of Plato and Plutarch; the historian of Sparta may not be prophetically conscious of Hobbes and Fichte and Lenin. To bring out such relations is one of the purposes of this book, and it is a purpose which only a wide survey can fulfil.
There are many histories of philosophy, but none of them, so far as I know, has quite the purpose that I have set myself. Philosophers are both effects and causes: effects of their social circumstances and of the politics and institutions of their time; causes (if they are fortunate) of beliefs which mould the politics and institutions of later ages. In most histories of philosophy, each philosopher appears as in a vacuum; his opinions are set forth unrelated except, at most, to those of earlier philosophers. I have tried, on the contrary, to exhibit each philosopher, as far as truth permits, as an outcome of his milieu, a man in whom were crystallized and concentrated thoughts and feelings which, in a vague and diffused form, were common to the community of which he was a part.