A simile, to be perfect, must both illustrate and ennoble the subject; must show it to the understanding in a clearer view, and display it to the fancy with greater dignity; but either of these qualities may be sufficient to recommend it.... That it may be complete, it is required to exhibit, independently of its references, a pleasing image; for a simile is said to be a short episode.
Samuel JohnsonThe good of our present state is merely comparative, and the evil which every man feels will be sufficient to disturb and harass him if he does not know how much he escapes.
Samuel Johnson