 A useful distinction related to the means of revelation (k) is between manifestational and non-manifestational revelation (Wolterstorff 1995: 26). Manifestational revelation happens when somebody “shows” or in some other way makes some reality manifest, while non-manifestational revelation takes place when something is revealed without being shown or manifested—for example, by means of verbal communication. According to Wolterstorff, the essential difference between these two ways of revealing is that in the case of manifestational revelation, the means of revelation is a natural sign of the reality revealed (such as the reality itself, or a characteristic causal effect of it). In the case of non-manifestational revelation, the means is not a natural sign. Instead it can be conventional sign (e.g., a sentence), or some other entity, such as a belief implanted in somebody’s mind by God. 