It goes without saying that if you're tired, you should take a rest.

Literal

Tired [if-ならば], rest [object-を] take [should-べき] [nominalizer-な] [possessive-の] [topic-は], say [until-まで] [also-も] not thing [copula-だ].

言うまでもない means 'it goes without saying' — literally 'it's not even something you need to say up to.' ~ならば is a more formal conditional variant of ~なら.