It is manifest that here are two alternatives, one after the other; the first is that of the Plangctae, the Claspers, which mean Death, unless they be avoided, yet this avoidance does not always mean Life. We can trace the connection with the Sirens: the absolute resignation to the senses is license, is destruction; we may say the same thing of the opposite, the absolute suppression of man's sensuous being is simply his dissolution. Hence the extremes appear; the moral and the immoral extremes land us in the same place; they are the two mighty rocks which may smite together and crush the poor mortal who happens to get in between the closing surfaces. If we understand the image, it holds true of excess on either side; excessive indulgence is overwhelmed by its opposite, so is excessive abstinence; they co-operate, like two valves, for the destruction of the one-sided extremist. Truly Greek is the thought, for the Greek maxim above all others was moderation, no over-doing. Such then are the Plangctae, which Ulysses must avoid wholly, if he wishes to escape. Still, even the danger is by no means over. There is the second way which introduces a new alternative; the path of moderation has its difficulty, it too forks and produces perplexity and peril to the voyager. Here is the point where Scylla and Charybdis appear, a new set of extremes, between which the mean is to be sought, then the passage can be made. Yet even thus it costs, Ulysses will lose six of his companions; the penalty has to be paid, just the penalty of moderation. _Es raecht sich alles auf Erden._ Two sets of extremes always; if you shun one set and take the middle path, just this act of shunning produces a second set; cut the magnet in twain with its two poles, then each part will at once have two poles of its own. Such is indeed the very dialectic of life, the dualism of existence, which the heroic voyager is to overcome with suffering, with danger, with many penalties. Fault has often been found with this duplication of the alternative, but when rightly seen into, it will show itself as the central fact of the entire description. It casts an image of the never-ceasing differentiation both in the mind and in the world; it hints the recurring contradiction in all thought and in all conduct, always to be solved, yet never quite solved. What else indeed has man to do? To master the contradiction gives him life, movement, energy, and it must be mastered every day. The old poet is going to the bottom of the matter. The above mentioned repetition of the alternative has its correspondence with the repetition which we have seen to be the fundamental form into which the whole Book is cast.