If not necessary, it is at least healthy for the writer to periodically vary the style, format and genre to which he shapes his ideas. This is the case for countless reasons, starting with how stimulating it is to do so, and also with the gradual awareness of the expressive possibilities that are never exhausted. More than that: in this exercise, one discovers that there are more suitable places for ideas and ideas, and one avoids having to mix them all up—because they will certainly come varied in the creative mind—in a single format. The best thing, then, is to vary like Voltaire; and it is good for the writer to keep this in mind if he does not do it spontaneously.