That is, I believe that the primary moral principles on which all others depend are rationally perceived. We ‘just see’ that there is no reason why my neighbour’s happiness should be sacrificed to my own, as we ‘just see’ that things which are equal to the same thing are equal to one another. If we cannot prove either axiom, that is not because they are irrational but because they are self-evident and all proofs depend on them. Their intrinsic reasonableness shines by its own light. It is because all morality is based on such self-evident principles that we say to a man, when we would recall
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