As I suggested at the opening of this part of the book, to avoid hubris we ought to think of this beast as more like a mule than a thoroughbred. Our … - Julian Baggini

Philosophers understandably focus on the nature of reason itself. However, in order for reason to flourish, it needs to be practised in the right environment. And that is sadly often lacking in the very places where reason is held in the highest esteem.

That is why there can be no one account that is ‘the truth’, not because ‘truth’ is beyond us. We need to distinguish between an account which is ‘the truth’ and one which is ‘truthful’. If by ‘the truth’ of a life we mean the one, true, complete account of it, then no such truths can be told. But we can tell more or less truthful stories about our lives and those of others: ones that do not gloss over embarrassing facts, ones that reveal many sides of a personality and not just those we wish to promote. Relating such a truthful story is not about cataloguing the largest possible number of true facts about a person. That is why our commitment to truth and rationality requires that our conceptual maps only include genuine features of what we are mapping and do not leave out anything that a user of that map might reasonably be expected to find useful. But the idea that we can come up with any kind of conceptual map that does not reflect our values and interests is a mirage. Philosophical autobiography helps us to see that behind all reasoning is a reasoner who can never drain away all her individuality.

Some may be surprised to have found that my defence of reason has been so eager to point out its limitations. With friends like me, you might wonder if reason needs enemies. But reason needs this kind of tough love. It cannot be treated like a child that needs unconditional support. Rather, it needs to be treated like an elite athlete that always needs to be pushed to work harder and improve, because otherwise nothing can be achieved. The most difficult issues we face often require us to go to the edge of reason, stretching its capacities to breaking point. To extend the training analogy, it would be a mistake only to praise it for what it does well almost effortlessly, such as analysing the formal logical validity of arguments or spotting contradictions. It needs also to pay attention to where it is naturally weaker, such as when it has to deal with ambiguity or premises that cannot be proven, and when it requires the careful use of judgement.