YOU SAID:
That which doesn't kill you makes you stronger.
INTO JAPANESE
あなたを殺さないものはあなたを強くします。
BACK INTO ENGLISH
Those that do not kill you strengthen you.
INTO JAPANESE
あなたを殺さないものはあなたを強化します。
BACK INTO ENGLISH
Those that do not kill you strengthen you.
That didn't even make that much sense in English.