كَمَا يَعُودُ ٱلْكَلْبُ إِلَى قَيْئِهِ، هَكَذَا ٱلْجَاهِلُ يُعِيدُ حَمَاقَتَهُ.
As a dog returneth to his vomit, so a fool returneth to his folly.