A Surd was going by train from Delhi to Bombay. He kept getting off at every station to buy a ticket till the next station. When the train reached Delhi, the Surd's co-passengers asked him why he kept on buying tickets instead of buying a ticket for the entire. The Surd replied that his doctor had advised him against taking long journeys.
When one door closes, another opens; but we often look so long and so regretfully upon the closed door that we do not see the one which has opened for us!!!