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

I suspect that some apparently homosexual people are really heterosexuals who deeply phobic about the opposite sex or have other emotional problems.

Stop asking for directions so much. Assuming that you're in a safe environment, pay attention and figure things out for yourself. Have the nerve to take a wrong turn now and then. You'll develop better working instincts and have more self-esteem too.

Common sense comes from experience, and kids need to fail as well as succeed in order to learn it. It's difficult to develop common sense when you spend a lot of time in your room where nothing much happens.

Know how and how much to tip people who expect gratuities, even in the case of poor service.

The 40s are when you start trading your psychological problems for physical ones.

Suppose you're on a game show, and you're given the choice of three doors. Behind one door is a car, the others, goats. You pick a door, say #1, and the host, who knows what's behind the doors, opens another door, say #3, which has a goat. He says to you: 'Do you want to pick door #2?' Is it to your advantage to switch your choice of doors?