Choosing a Password
Bruce Schneier's E-Mail Security: How to Keep Your Electronic Messages Private suggests that it's very important to choose a password that no one would guess. This is because that password is your personal identity; it's like your fingerprint. If someone gets a hold of it, they could find out so much of your personal information. Do not tell your password to anyone because it could get into the wrong hands. Do not even tell your mom, spouse, or boss no matter how much you trust them. Make sure you remember it and don't write it down anywhere.
Schneier, Bruce. E-Mail Security: How to Keep Your Electronic Messages Private. John Wiley & Sons Inc.