"The life of most insects is nothing but a restless labour for preparing nourishment and dwelling for the future offspring that will come from their eggs. After the offspring have consumed the nourishment and have turned into the chrysalis stage, they enter into life merely to begin the same task again from the beginning. We then reflect how, in a similar manner, the life of birds is taken up with their distant and wearisome migration, then with the building of the nest and the procuring of food for the offspring, and how these themselves have to play the same role in the following year; and thus all work constantly for the future that afterwards becomes bankrupt. If we consider the foregoing, we cannot help looking round for the reward of all this skill and exertion, for the end or aim which the animals have before their eyes, and to which they aspire so restlessly; in short, we cannot help asking what comes of all this, and what is attained by animal existence that demands such immense preparations. And there is nothing to show but the satisfaction of hunger and sexual passion, and in any case a little momentary gratification, such as falls to the lot of every individual animal, now and then, between its endless needs and exertions. If we put the two together, the inexpressible ingenuity of the preparations, the untold abundance of the means, and the inadequacy of what is thus aimed at and attained, we are driven to the view that life is a business whose returns are far from covering the cost."