Brainwallets, where you choose the phrase that unlocks the wallet, are a bad idea for this reason. Plenty of people have lost a lot of money from trying clever

Brainwallets, where you choose the phrase that unlocks the wallet, are a bad idea for this reason. Plenty of people have lost a lot of money from trying clever things like using their favorite line from a piece of media. However, if you have a seed phrase of 12 randomly-chosen words (that were properly randomly chosen by software, not a person), then that's enough to be safe.