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The will to live, which forms the innermost kernel of every living being, is most distinctly apparent in the highest, that is to say in the cleverest, order of animals, and therefore in them we may see and consider the nature of the will most clearly. For below this order of animals the will is not so prominent, and has a less degree of objectivation; but above the higher order of animals, I mean in men, we get reason, and with reason reflection, and with this the faculty for dissimulation, which immediately throws a veil over the actions of the will. But in outbursts of affection and passion the will exhibits itself unveiled. This is precisely why passion, when it speaks, always carries conviction, whatever the passion may be; and rightly so. For the same reason, the passions are the principal theme of poets and the stalking-horse of actors. And it is because the will is most striking in the lower class of animals that we may account for our delight in dogs, apes, cats, etc.; it is the absolute naivete of all their expressions which charms us so much.
What a peculiar pleasure it affords us to see any free animal looking after its own welfare unhindered, finding its food, or taking care of its young, or associating with others of its kind, and so on! This is exactly what ought to be and can be. Be it only a bird, I can look at it for some time with a feeling of pleasure; nay, a water-rat or a frog, and with still greater pleasure a hedgehog, a weazel, a roe, or a deer. The contemplation of animals delights us so much, principally because we see in them our own existence very much simplified.
There is only one mendacious creature in the world—man. Every other is true and genuine, for it shows itself as it is, and expresses itself just as it feels. An emblematical or allegorical expression of this fundamental difference is to be found in the fact that all animals go about in their natural state; this largely accounts for the happy impression they make on us when we look at them; and as far as I myself am concerned, my heart always goes out to them, particularly if they are free animals. Man, on the other hand, by his silly dress becomes a monster; his very appearance is objectionable, enhanced by the unnatural paleness of his complexion,—the nauseating effect of his eating meat, of his drinking alcohol, his smoking, dissoluteness, and ailments. He stands out as a blot on Nature. And it was because the Greeks were conscious of this that they restricted themselves as far as possible in the matter of dress.