Humor is a very important thing. It is a natural predilection. It is an emotional release.
There is no defense against adverse fortune which is so effectual as an habitual sense of humor.
HUMOR, DEFENSE AGAINST ADVERSE FORTUNE
In truth, politeness is artificial good humor, it covers the natural want of it, and ends by rendering habitual a substitute nearly equivalent to the real virtue.
HUMOR, POLITENESS IS ARTIFICIAL GOOD HUMOR
You may not be able to change a situation, but with humor you can change your attitude about it.
When you say a friend has a sense of humor do you mean that he makes you laugh, or that he can make you laugh?