A distinguished agnostic once observed that in these days Christianity was not refuted, it was explained. Doubtless the difference between the two operations was, in his view, a matter rather of form than of substance. That which was once explained needed, he thought, no further refutation. And certainly we are all made happy when a belief, which seems to us obviously absurd, is shown nevertheless to be natural in those who hold it. But we must be careful. True beliefs are effects no less than false. In this respect magic and mathematics are on a level. Both demand scientific explanation ; both are susceptible of it. Manifestly, then, we cannot admit that explanation may be treated as a kind of refutation. /.../ This way lies universal scepticism. Thus would all intellectual values be utterly destroyed.