Back up everything! You are not invulnerable. Catastrophic data loss can happen to you - one worm or Trojan is all it takes.

When you fall, get right back up.

Back in my day, I would probe by hand. Now you can get commercial software that does the job for you.

I failed, got back up. I failed, got back up.

It's not bragging if you can back it up.

The government does things like insisting that all encryption programs should have a back door. But surely no one is stupid enough to think the terrorists are going to use encryption systems with a back door. The terrorists will simply hire a programmer to come up with a secure encryption scheme.