عَوِّدْ لِسَانَكَ قَوْلَ الخَيْرِ تَحْظَ بِهِ
إِنَّ اللِّسَانَ لِمَا عَوَّدْتَ مُعْتَادُ
Train your tongue to say good and you will attain it
For the tongue is accustomed to what you accustom it
المصدر · Source: Diwan al-Shafi'i. Ed. A. Shakir