Are there absolute truths that can be gradually approached over time through rational processes? Or are all modes and systems of thought equally valid if viewed from within their own internally consistent frames of reference? Are there universal forms of reasoning and understanding that enable us to distinguish between rational beliefs and those that are demonstrably false, or is everything relative?

These central questions are addressed and debated by the distinguished contributors to this lively book. Some of them -- Hollis, Lukes, Robin Horton, and Ernest Gellner -- discuss new...