go without saying
To be unambiguous, perfectly clear, or self-evident; to be already acknowledged, established, or accepted. This should go without saying, but you will receive an automatic zero if you are caught cheating on the exam.
go without saying
Be self-evident, a matter of course. For example, It goes without saying that success is the product of hard work. This expression is a translation of the French cela va sans dire. [Second half of 1800s]
go without saying
be too well known or obvious to need to be mentioned.