One of the things we have learnt from the intense study of nature is that behind every desire of man and of all living things there is some justification and some fulfilment. That whatever men have persistently longed for and desired has some reality. Nature does nothing uselessly. God implants in human hearts no desire however fantastic that has not fulfilment. Dreams in one generation become commonplace realities in the next. Look back a thousand years and read the dreaming literature of that period and now we have got beyond the dreams and live in the reality. Man is never satisfied. As fast as one desire is satisfied new desires spring from our mind. Man has always desired to live; he naturally hates death. There is a sadness connected with the last time he does anything.