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One astonishing possible explanation for the function of reason only emerged about ten years ago: the argumentative hypothesisfn5 suggests reason arose in the human brain not to inform our actions and beliefs, but to explain and defend them to others. In other words, it is an adaptation necessitated by our being a highly social species. We may use reason to detect lying in others, to resolve disputes, to attempt to influence other people or to explain our actions in retrospect, but it seems not to play the decisive role in individual decision-making.

If your view of the world is that people use reason for their important decisions, you are setting yourself up for a life of frustration and confusion. You'll find yourself continually debating people and never winning except in your own mind. Few things are as destructive and limiting as a worldview that assumes people are mostly rational.

reason seems to have given us remarkable advantages over other animals - and it is unlikely that we could have produced many of our technological and cultural successes without it.