YOU SAID:

A wizard that never knows his spells is not a wizard at all

INTO JAPANESE

自分の呪文をまったく知らない魔法使いは魔法使いではありません

BACK INTO ENGLISH

A wizard who knows nothing of his spells is not a wizard

INTO JAPANESE

自分の呪文を何も知らない魔法使いは魔法使いではない

BACK INTO ENGLISH

A wizard who knows nothing of his spells is not a wizard