Amazing intellectual history, managing to incorporate social changes and the evolution of thoughts, as well as their mutual interaction. It covers a wide range of thoughts, including religion, philosophy, natural and social science, and literature (even arts and architectonics!). I especially like his analysis of Marxism and the general left-wing thoughts. Over hundreds of years, it seems to be a tradition that Western intellectuals kept being tempted into Marxism or left-wing belief as a solution when crises broke, which usually turned out to be in vain.