A rough circumscription of our area of study will be achieved when I say that by images I mean the kind of thing about which Ian Crombie and Austin Farrer have written in Faith and Logic and Farrer also in The Glass of Vision. In the latter work Farrer cites as examples of religious images the Kingdom of God, the Son of Man, the Israel of God and the ‘infinitely complex and fertile image of sacrifice and communion, of expiation and covenant’. Farrer's images are essentially verbal pictures whose function is to interpret and elucidate revelatory events. He writes:
The great images interpreted the events of Christ's ministry, death and resurrection, and the events interpreted the images; the interplay of the two is revelation. Certainly the events without the images would be no revelation at all, and the images without the events would remain shadows on the clouds. The events by themselves are not revelation, for they do not by themselves reveal the divine work which is accomplished in them: the martyrdom of a virtuous Rabbi and his miraculous return are not of themselves the redemption of the world.