It is generally acknowledged that Hobbes's radical scepticism is intimately connected with his nominalism, and that his nominalism in turn rests upon the doctrine of meaning and truth set out in its best-known version in Chapters 4 and 5 of Leviathan.

It has been said, and few would deny, that John Locke is as important as the founder of philosophical liberalism as he is as the founder of the empiricist theory of knowledge. Though he was a most versatile thinker, writing on philosophy, politics, medicine, education, religion, and economics, and on all these with the knowledge of an expert and the influence of an authority, his fame no doubt derives on the one hand from his treatises on Toleration and Civil Government, and from his Essay on Human Understanding on the other. Whenever these are expounded by scholars, the political writings are discussed independently of the Essay and the Essay independently of the political writings. The reason for this is obviously that scholars have seen very little connexion between Locke's principal works. This has been changed with the appearance of a manuscript in which are preserved eight essays on the law of nature written by Locke in Latin shortly after the Restoration of 1660 and thirty years before the appearance in print of his major works. This manuscript has been published by me, and it is now possible to recognize that Locke's two main bodies of doctrine, namely his political theory and his theory of knowledge, have a common ground and that this lies in his early doctrine of natural law. Admittedly, the notion of a natural law can be seen to be of central importance in his treatise on Civil Government and it also plays its part in the Essay.

“I have never been able to read Hegel: I initiated my attempt by studying some remarks of his on mathematics which struck me as complete nonsense. It was foolish of me, but I am not writing to explain my good sense.”—A. N. Whitehead.

The need for objective standards of judgement is acutely felt in the bewilderment created by the world situation of our time, a bewilderment that is partly the result of the rapid advance of the natural sciences, with its profound effects upon metaphysical doctrines, religious beliefs and moral attitudes, and partly due to the intractable problems which have arisen in social and political fields. The progress of the sciences, while it seems to have given us secure knowledge of the world about us, has, at the same time, undermined confidence in the criteria of belief and judgement in the conduct of affairs which hitherto had served to guide mankind. Bereft of these the majority of men are unable to see a clear way through the complexities of modern political and economic life and are overwhelmed by the major problems that confront them. As examples of the major perplexities with which mankind is faced today, I shall mention only three:—