A good, real, unrestrained, hearty laugh is a sort of glorified internal massage, performed rapidly and automatically. It manipulates and revitalizes corners and unexplored crannies of the system that are unresponsive to most other exercise methods. With the fearful strain that is on me night and day, if I did not laugh I should die.
Abraham LincolnUpon this subject, the habits of our whole species fall into three great classes--useful labour, useless labour and idleness. Of these the first only is meritorious; and to it all the products of labour rightfully belong; but the two latter, while they exist, are heavy pensioners upon the first, robbing it of a large portion of it's just rights. The only remedy for this is to, as far as possible, drive useless labour and idleness out of existence.
Abraham Lincoln