Definitions...

A woman worries about the future until she gets a husband.
A man never worries about the future until he gets a wife.
A successful man is one who makes more money than his wife can spend.
A successful woman is one who can find such a man.

HAPPINESS

To be happy with a man, you must understand him a lot and love him a little.
To be happy with a woman, you must love her a lot and not try to understand her at all.

PROPENSITY TO CHANGE

A woman marries a man expecting he will change, but he doesn't.
A man marries a woman expecting that she won't change, and she does.