Be able to keep a secret or promise when you know in your heart that it is the right thing to do.

The difference between America and England is that the English think 100 miles is a long distance and the Americans think 100 years is a long time. The difference between an autobiography and an unauthorized biography is like the difference between an account of your life written by your mother and one written by your mother-in-law.

Make a habit of canceling every subscription to anything you don't have time to read

If you never heard opportunity knock, maybe you're never at home.

Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion.

Be able to tell whether garments that look good on the hanger actually look good on you

Know how to behave at a fine restaurant, which is a telltale measure of social maturity.