No man's credit is ever as good as his money.
Don't abuse your friends and expect them to consider it criticism.
To avoid mistakes and regrets, always consult your wife before engaging in a flirtation.
When a friend is in trouble, don't annoy him by asking if there is anything you can do. Think up something appropriate and do it.
There must be some good in the cocktail party to account for its immense vogue among otherwise sane people.
A theory is no more like a fact than a photograph is like a person.