The Secret of Success

Humans can coordinate around shared myths that get rewritten as circumstances change, rebuild institutions when old ones stop working, and absorb foreign practices without necessarily losing their core identity. Empires and religions historically spread not only through force, but through a willingness to copy whatever demonstrably worked elsewhere: useful crops, efficient scripts, superior technologies, and effective administrative habits, regardless of which culture originally invented them.

Seen this way, history looks less like a clean contest between pure, self-contained civilizations and more like a constant traffic in borrowed tools that later get relabeled as native tradition. Societies routinely steal ideas from their neighbors and rivals, remix them with existing practice, and within a generation or two simply call the resulting mixture their own tradition, with the borrowing quietly forgotten. Winners in these historical contests absorb genuine features from the people they conquer, and the conquered in turn adopt features from their conquerors, so that the cultural boundaries that once looked sharp gradually blur into something neither side started with.

Harari's own framing is starker than a story about clever borrowing. He calls history a level-two chaotic system: one that reacts to predictions made about it, and therefore cannot be predicted at all.

The chapter's harder claim, made in its second half under the heading "Blind Clio," is that history's choices are not made for our benefit at all. Harari borrows the language of memetics: a culture can be modelled as a complex of ideas that propagates itself, spreading or dying irrespective of the costs and benefits to its human hosts. A successful culture on this account is simply one that reproduces well — not one that makes the people carrying it happier, freer, or better off. A society that categorically cannot bend to new circumstances eventually breaks under pressure it can't absorb. A society that bends without any stabilizing limit at all simply dissolves, having given up the shared identity that made large-scale cooperation possible.

He adds a warning about hindsight: the better you know a period, the harder it becomes to explain why things happened one way rather than another, because from inside the moment many paths looked possible.