At times almost all of us envy the animals. They suffer and die, but they do not seem to make a “problem” of it. Their lives seem to have so few complications. They eat when they are hungry and sleep when they are tired, and instinct rather than anxiety seems to govern their few preparations for the future. As far as we can judge, every animal is so busy with what he is doing at the moment that it never enters his head to ask whether life has a meaning or a future. For the animal, happiness consists in enjoying life in the immediate present - not in the assurance that there is a whole future of joys ahead of him.