Those who can't laugh at themselves leave the job to others.
Laughing helps. It's like jogging on the inside.
You are never fully dressed until you wear a smile.
Laughter is like changing a baby's diaper. It doesn't permanently solve any problems, but it makes thing more acceptable for awhile.
Laugh a lot, and when you're older, all your wrinkles will be in the right places.
It is better to weep with wise men than to laugh with fools. Spanish Proverb
If we may believe our logicians, man is distinguished from all other creatures by the faculty of laughter." ~ Joseph Addison
Laughter is the closest thing to the grace of God.-Karl Barth
Mirth is God's medicine. Everybody ought to bathe in it. Grim care, moroseness, anxiety--all this rust of life--ought to be scoured off by the oil of mirth.--Henry Ward Beecher (1813-1887)
Laughter is the shortest distance between two people. Victor Borge
In a time like the present, when the ties of religion have been sadly relaxed, there is a tendency for popular leaders to exalt themselves in a kind of bogus deity and to think their shallow creeds a divine revelation. The answer to all that sort of folly islaughter. John Buchan, 1938
Blessed are they that can laugh at themselves,| for they shall never lack a source of amusement.
Matthew 5:10b (Unauthorised Version)
Laugh and the world laughs with you, snore and you sleep alone. ~Mrs Patrick Campbell, letter to GBS (1912)
I used to always think that I'd look back on us crying and laugh, but, I never thought I'd look back on us laughing and cry. - Ralph Waldo Emerson, 1803 - 1882
Many times what cannot be refuted by arguments can be parried by laughter.--Desiderius Erasmus (1466-1536)_The Praise of Folly_ 
Once you get people laughing, they're listening and you can tell them almost anything. Herbert Gardner
Comedians and politicians each tell the audience what it wants to hear. The difference is that the audience laughs at the comedian and the politician laughs at the audience.-- Alexis A. Gilliland
Laughter is a tranquilizer with no side effects. Arnold H. Glasow
Man is the only animal that laughs and weeps; for he is the only animal that is struck with the difference between what things are and what they might havebeen. William Hazlitt
If you don't learn to laugh at trouble, you won't have anything to laugh at when you're old. --Ed Howe
At least one way of measuring the freedom of any society is the amount of comedy that is permitted, and clearly a healthy society permits more satirical comment than a repressive, so that if comedy is to function in some way as a safety release then it must obviously deal with these taboo areas. This is part of the responsibility we accord our licensed jesters, that nothing be excused the searching light of comedy. If anything can survive the probe of humour it is clearly of value, and conversely all groups who claim immunity from laughter are claiming special privileges which should not be granted. Eric Idle
If you are not allowed to laugh in heaven, I don't want to go there. --Martin Luther (1483-1546)
It is pleasing to God whenever thou rejoicest or laughest from the bottom of thy heart. --Martin Luther (1483-1546)
Life does not cease to be funny when people die; any more than it ceases to be serious when people laugh. George Bernard Shaw
A good laugh is sunshine in a house. --- William Makepeace Thackeray
Nature has made us frivolous to console us for our miseries. Voltaire, 1764