«مِنْ نَصَحْ جَاهِلْ عَادَاهْ»

The saying warns that guidance offered to an ignorant or foolish person rarely brings thanks. Such a person tends to take correction as an insult, so the well-meaning adviser ends up with resentment and hostility instead of gratitude.

In practice, the proverb recommends caution about whom one tries to set straight. Counsel is worth giving only to people able to receive it, and pressing it on the unreceptive may cost a relationship without changing anything.

Fits moments when someone has tried to correct a stubborn or uninformed person and met only anger. It can also warn a friend not to waste good counsel on someone unwilling to hear it. It is pointed, and it labels the listener a fool.