The Civilisation That Forgot How to Think is a work of philosophical anatomy. Its argument is deceptively simple: the most consequential crisis facing humanity is not climate change, governance failure, or technological disruption — it's the progressive erosion of the cognitive and moral capacities required to respond to any of them adequately. The book does not add to the long shelf of crisis literature. It asks the prior question: what kind of thinking does this moment require, and what has happened to our capacity to produce it?Philosopher, futurist, and adviser Richard David Hames traces eleven interconnected failures — from governance systems that cannot represent future generations, to complexity deliberately manufactured as a barrier to accountability, to educational institutions redesigned to serve economic productivity rather than form thinking people, to the abdication of independent judgement to algorithms and authorities. Each failure is documented with rigour and global reach, drawing on evidence from around the world. The diagnosis is planetary, not provincial.Against this anatomy of failure, Hames advances three original contributions. The first is syntrophic inquiry — a mode of knowing that moves between scales, perceives systemic interactions rather than isolated components, and understands the quality of the knower as inseparable from the quality of the knowledge. The second is the expanded now — a temporal methodology that draws the deep past and the memories of the deep future simultaneously into the present inquiry space, approaching what Hames calls a zero-point field of time and space in which deep inquiry becomes possible precisely because the compulsion to conclude has been suspended. The third is the trimunary — a decision instrument that asks of any system, institution, or course of action whether it is adequate to three simultaneous obligations: to those alive now, to future generations, and to the living systems on which both depend.These are the conditions under which adequate thinking becomes possible — and the book argues that recovering them is the precondition for addressing every other crisis we face. Months before his death, Bruno Latour described Richard David Hames as "e;the most consequential philosopher in the field of civilisation-scale world systems."e; This is the book that justifies that description.