Ìgbin tó wá ẹ̀jẹ̀ lọ sí ilé alákàn, bó ti wọlé ni yóò padà jáde. / Any snail that goes to the crab's burrow in search of blood, will come out the same way it goes in (empty-handed, as crabs have no blood). [Be result-oriented; avoid fruitless pursuits.] #Yoruba #proverb