it goes without saying; needless to say
Fixed expression used to emphasize that something is so obvious it is foolish to even mention it. Often followed by a clause stating the obvious fact.
It goes without saying that health is the most important thing.
Needless to say, being late is strictly forbidden.
Standard kanji spelling for this fixed expression.
Kana spelling of the second part; less common but still seen.
A fixed phrase combining 言う (to say) + も (even) + 愚か (foolish), literally 'even saying it is foolish'.