YOU SAID:
I know kingdom hearts is light
INTO JAPANESE
私はキングダムハーツ知っている光
BACK INTO ENGLISH
I know hearts light
INTO JAPANESE
心の光を知っています。
BACK INTO ENGLISH
Know the heart of light.
INTO JAPANESE
光の心を知っています。
BACK INTO ENGLISH
Know the heart of light.
That didn't even make that much sense in English.