On closer inspection, we find that there is an extremely strange contradiction in our world. Of the numerous things in this world, everything has taken its ultimate shape. We cannot think of any other colour for the sky except blue. Neither can we think of any other colour for light and water. We cannot think of any other form, which the grass or the trees could have. Nor can we think of any other colour for the vegetation but green. Even our greatest artists could not produce any other model for the ants or the tiger, for the deer or the elephant or the birds or the fish, and so on. It is a fact that everything in this world has been cast in its final mould. We just cannot think of a better model for anything that exists in this world of nature.

However, there is only one aspect of this vast world - an exception to this general rule - and that is the recurrence of the many unpleasant things in the human world. Here there is suffering, old age, accidents and finally death. Human life is marked with all kinds of misery and fear. Even when there does not appear to be any problem, there are boredom and tension, which in themselves are unbearable.
This is a contradiction.