First published in 2002. This is Volume VIII of the Library Psychology 12 volume series. The philosophical problem addressed by this book is perhaps the one most relevant to the life of the average unphilosophical man. It can be argued that every man assumes a solution in his life. Much of the first half of this book is historical or exploratory. The second half is highly analytical, examining the relations between ethical claims and other kinds of claims that generally are accorded cognitive status. This is designed to be work of a kind with which advanced students in philosophy are most familiar.