A day without laughter is a day wasted.
Charlie Chaplin

Laughter is an instant vacation.
Milton Berle

The human race has one really effective weapon, and that is laughter.
Mark Twain

He who has laughter on his side has no need of proof.
Theodor Adorno

Against the assault of laughter, nothing can stand.
Mark Twain

Laughter is the best medicine - unless you're diabetic, then insulin comes pretty high on the list.

Laughter is inner jogging.
Norman Cousins

We do have a zeal for laughter in most situations...give or take a dentist.
Joseph Heller

God is a comedian playing to an audience too afraid to laugh.
Voltaire 

Humor is a prelude to faith and laughter is the beginning of prayer.
Reinhold Niebuhr 

On average, an infant laughs nearly two hundred times a day; an adult, only twelve.
I Ching 

If you would not be laughed at, be the first to laugh at yourself.
Benjamin Franklin 

Like all young men I set out to be a genius, but mercifully laughter intervened.
Lawrence Durrell