The will to live, which forms the inmost core of every living being, exhibits itself most conspicuously in the higher order of animals, that is, the cleverer ones; and so in them the nature of the will may be seen and examined most clearly. For in the lower orders its activity is not so evident; it has a lower degree of objectivation; whereas, in the class which stands above the higher order of animals, that is, in men, reason enters in; and with reason comes discretion, and with discretion, the capacity of dissimulation, which throws a veil over the operations of the will. And in mankind, consequently, the will appears without its mask only in the affections and the passions. And this is the reason why passion, when it speaks, always wins credence, no matter what the passion may be; and rightly so. For the same reason the passions are the main theme of poets and the stalking horse of actors. The conspicuousness of the will in the lower order of animals explains the delight we take in dogs, apes, cats, etc.; it is the entirely naive way in which they express themselves that gives us so much pleasure.
The sight of any free animal going about its business undisturbed, seeking its food, or looking after its young, or mixing in the company of its kind, all the time being exactly what it ought to be and can be,—what a strange pleasure it gives us! Even if it is only a bird, I can watch it for a long time with delight; or a water rat or a hedgehog; or better still, a weasel, a deer, or a stag. The main reason why we take so much pleasure in looking at animals is that we like to see our own nature in such a simplified form. There is only one mendacious being in the world, and that is man. Every other is true and sincere, and makes no attempt to conceal what it is, expressing its feelings just as they are.
From Arthur Schopenhauer’s “Psychological Observations.” Translated by T. Bailey Saunders.