Michael Oakeshott mounts a sustained argument against the idea that politics can be guided by abstract principles, ideological blueprints, or technical expertise detached from lived experience. Writing from his position as a political philosopher at the London School of Economics, Oakeshott draws a sharp distinction between two kinds of knowledge: the theoretical knowledge found in books and manuals, and the practical knowledge that can only be acquired through long experience and immersion in a tradition. The rationalist, in Oakeshott's telling, is the person who believes the first kind is sufficient and the second dispensable—the political reformer who arrives with a plan derived from first principles, convinced that centuries of accumulated practice can be safely discarded. The title essay, first published in 1947, takes aim at both left-wing central planners and right-wing ideologues, arguing that both share the same fundamental error of treating politics as an engineering problem with optimal solutions. Other essays in the collection extend this critique into education, where Oakeshott warns against reducing learning to the transmission of information, and into the nature of conservatism, which he defines not as a set of policies but as a disposition to prefer the familiar to the unknown. His essay on the Tower of Babel reads Genesis as a parable about the dangers of pursuing moral perfection through collective action. Throughout, Oakeshott writes in a distinctive prose style—measured, allusive, and often deliberately provocative—that has made these essays enduringly influential among thinkers skeptical of grand political projects.