The most wasted of all days is one without laughter.
E. E. Cummings (1894-1962) 

The truth is, laughter always sounds more perfect than weeping. Laughter flows in a violent riff and is effortlessly melodic. Weeping is often fought, choked, half strangled, or surrendered to with humiliation.
Anne Rice  - Taltos

This world is a comedy for those who think and a tragedy for those who feel.
Horace 

Those who do not know how to weep with their whole heart, don't know how to laugh either.
Golda Meir (1898-1978) 

To be interested in the changing seasons is a happier state of mind than to be hopelessly in love with spring.
George Santayana (1863-1952) 

Washington is a city of Southern efficiency and Northern charm.
John F. Kennedy (1917-1963) 

We are all here for a spell; get all the good laughs you can.
Will Rogers (1879-1935) 

When a person can no longer laugh at himself, it is time for others to laugh at him.
Thomas Szasz  - The Second Sin, 1973

Worry never robs tomorrow of its sorrow, it only saps today of its joy.
Leo Buscaglia