a word to the wise

used before advising someone or giving them a warning

The idiom "a word to the wise" is believed to have originated in the 16th century and is used to preface advice or a warning, often given in a gentle or informal manner. It suggests that the speaker is imparting valuable information or guidance that the listener should consider and act upon.

A word to the wise: always check the expiration date before consuming food or medication.
A word to the wise: avoid swimming in unfamiliar waters, especially if there are posted warnings or lifeguards are absent.
A word to the wise: be cautious when sharing personal information online, as it can be misused or fall into the wrong hands.
A word to the wise: save money regularly, even small amounts, as it can accumulate over time and provide financial security in the future.
A word to the wise: treat others with kindness and respect, as you never know when you might need their help or support.