 Ìgbin tó wá ẹjẹ lọ sí ilé alákàn, bó ti wọlé ni yóò padà jáde.  Any snail that goes to the crabs 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 : Negative 