A word to the wise is sufficient?

Answer 1

Here's good advice, as in A word to the wise: don't walk alone here because these streets are not safe at night. A shortening of A word to the wise is enough, as it was put by Roman writers, this phrase in English dates from the mid-1500s.

Answer 2

This warning or heads-up just given will be caught quickly, understood and acted upon by anyone who is wise.