The _first_ point we have to draw attention to in the _metaphor_ is this, that it may be accepted at once as essentially a simile, in so far as it expresses clear and self-subsistent significance in a similar phenomenon of reality comparable with it. In the comparison as such, however, both sides of the comparison, that is the real meaning and the image, are definitely kept apart from each other, while on the contrary in the metaphor this separation, albeit it is essentially present, is _not_ as yet clearly _posited._ For this reason Aristotle long ago distinguished comparison and metaphor by his statement that a "how" is added to the former which is absent from the latter. In other words the metaphorical expression specifies but _one_ aspect, the image. In the context, however, to which the image is attached, the real significance which is intended lies so near that it is at the same time immediately asserted without any direct separation of it from the image. When it is said, for example: "the Spring-time of these cheeks," or "a sea of tears," we are inevitably forced to accept such an expression as an image rather than an actual fact, an image whose significance the context at the same time expressly designates. In the symbol and allegory the relation of actual meaning to external form is not asserted either so immediately or necessarily. From the fact that an Egyptian staircase consists of nine stages, and a hundred other circumstances of similar pregnancy, it is only the adept, the connoisseur, and the professor who will derive a symbolical significance, and doubtless will scent out and discover much that is both mystical and symbolical into the bargain, which is so much ingenuity of research thrown away for the reason that what is discovered is not there. This may have happened often enough to my honoured friend Creutzer, no less than our latter-day Platonists and the commentators of Dante.
(_a_) In range and variety of form it is impossible to exhaust the resources of metaphor; its definition, however, is simple. It is a wholly abbreviated comparison, in which we find, as a fact, image and significance are not as yet set in opposition to one another, but only the image is introduced by it; at the same time, however, the meaning which is thus attached to the image is not its real meaning; this is as it were effaced, and by virtue of the content in which it is set we are enabled to recognize the significance which is really intended in the image itself, albeit that meaning is not expressly asserted.