Don't create your own passphrase. Use electrum and it will make one for you. Memorize that.
If you want to know why creating your own passphrase is a bad idea please see below:
BIP∞: Brainwallets.
FOR GODS SAKE. DON'T DO IT. YOU MAY THINK YOU ARE SMART ENOUGH. SO DID EVERYONE ELSE WHO GOT ROBBED. HUMANS ARE NOT A GOOD SOURCE OF ENTROPY.
YOU HAVE A SCHEME? Pfft. THE SPACE OF ALL SCHEMES YOU'RE LIKELY TO HAVE PROBABLY ONLY HAS A FEW BITS OF ENTROPY. RANDOM PHRASE IN A BOOK? THERE ARE ONLY ABOUT 30 BITS OF SENTENCE SELECTION IN A LIBRARY.
OH NO. YOU ARE NOT LISTENING TO ME, ARE YOU?
OH CRAP. YOU THINK THAT "EIGHT CHARACTERS AND ONE FROM EACH CHARACTER CLASS" APPLIES HERE?? WEBSITE SECURITY MIGHT HAVE TO DEAL WITH 1000 ATTEMPTS PER SECOND, BUT SOME DUDE WITH A FPGA FARM IS PROBABLY PRECOMPUTING A BILLION BRAINWALLETS PER SECOND. JUST STOP.
NOOOOOOOOOOOO.
Well, now that you have no more Bitcoin I guess we don't have to worry about you using a brainwallet.
Cheers.