If you wallet is using the BIP39 standard you just memorize the 12-word phrase. The words come from the key, not vice versa. Also, you can get by with just mem

If you wallet is using the BIP39 standard you just memorize the 12-word phrase. The words come from the key, not vice versa. Also, you can get by with just memorizing one phrase, because unlimited addresses are tied sequentially to a single phrase.