Don't count your chickens before the eggs have hatched
別過早樂觀，不要依賴尚未實現的事情做計劃，避免失望。
勸人謹慎，避免過度樂觀或提前慶祝。
英文釋義
Don't make plans for something that might not happen.
例句
You might win the lottery, but don't count your chickens before they hatch.
典故來源
源自伊索寓言《擠奶女工》，女工幻想賣雞蛋發財卻打碎籃子，警示空想。