YOU SAID:

the only way into the castle of ones heart is to knock.

INTO JAPANESE

心はノックするものの城に唯一の方法。

BACK INTO ENGLISH

Heart is the only way to a knock at the Castle.

INTO JAPANESE

心は城をノックする唯一の方法です。

BACK INTO ENGLISH

Heart is the only way to knock out the Castle.

INTO JAPANESE

心は、城をノックアウトする唯一の方法です。

BACK INTO ENGLISH

Heart is the only way to knock out the Castle.