YOU SAID:

what is to do is to do what is not not it

INTO JAPANESE

やるべきことはやらないことであり、それはやらないことである

BACK INTO ENGLISH

What to do is not to do, and what not to do is to not do

INTO JAPANESE

やるべきことはやらないこと、やるべきでないことやらないこと

BACK INTO ENGLISH

Don't do what you should do, and don't do what you shouldn't do.

INTO JAPANESE

すべきことをせず、すべきでないことをしないでください。

BACK INTO ENGLISH

Don't do what you should do and don't do what you shouldn't do.

INTO JAPANESE

やるべきことをやらず、やるべきでないことをやらない。

BACK INTO ENGLISH

Don't do what you should do and don't do what you shouldn't do.