Definition of a word to the wise is enough in English English dictionary
(Atasözü) You only have to hint something to wise people in order to get them to understand it.; Wise people do not need long explanations. (Often used to signal that you are hinting something.)
1. John's a pleasant man, but I wouldn't trust him with money. A word to the wise, eh?
2. Donna hinted about Lisa's drinking problem to Lisa's fiancé, hoping that a word to the wise would be enough.