Something many people don't realize: A 3 to 4 word phrase that's not 'common' (Quick Brown Fox = bad) is MUCH harder for hackers to crack than even a single word with random characters.

Using Common Phrases Makes Your Passphrase Password Useless: Here’s How to Pick a Better Phrase
We've discussed how using passphrases as passwords can boost your security, but if you've chosen a phrase used in every-day speech, you're not doing yourself—or your data—any favors.