Do not count your chickens before they hatch

يعني أنه يجب عليك عدم وضع خطط تعتمد على شيء جيد يحدث قبل أن تعرف أنه حدث بالفعل.

مثال على استخدامه:

She wanted to buy a dress in case someone asked her to the dance, but I told her not to count her chickens before they hatched.