This essay uses T. E. Lawrence's characterization of doubt as ‘our modern crown of thorns’, as an entrée into thinking through the coincidence of doubt and faith in the four canonical gospels. However much each of the gospels may wish to induce faith, it leaves its readers with the distinct impression that doubt, understood differently in each, cannot be fully dispelled. The gospels thereby testify to a lively, ancient appreciation for the irrepressibility of doubt. This essay then turns to the problem of scepticism in modern philosophy. In his work on Ludwig Wittgenstein, the American philosopher Stanley Cavell suggests that scepticism is a ‘condition’ of knowledge, both in the sense of something from which we suffer as if from a chronic illness, and in the sense of that which makes knowledge possible at all. The reader is invited to think of the dialectics of doubt and faith in a similar way, of doubt as the very condition of faith.