Stupidity, selfishishness and good health are the three requirements for happiness, though if stupidity is lacking, all is lost.
Gustave Flaubert

Happiness makes up in height for what it lacks in length.
Robert Frost

Happiness is a butterfly which when pursued is always just beyond your grasp but which if you will sit down quietly may light upon you.
Nathaniel Hawthorne

Happiness, happiness, the greatest gift that I possess
I thank the Lord that I've been blessed with all my share of happiness.
Ken Dodd