وَلَا وَرَعَ كَالْكَفِّ
Translation: There is no moral caution like restraining oneself from what is improper.
Source: al-Bayhaqi
Key vocabulary: وَرَعَ — scrupulous moral caution; الْكَفِّ — holding back or refraining.
Brief grammar: وَلَا وَرَعَ begins with وَ (“and”) plus negating لَا. The phrase كَالْكَفِّ compares scrupulousness to the act of refraining.
Moral caution is shown in restraining oneself from wrongdoing, harming others, or a serious suspicion of impropriety. Looking pious while injuring others is the opposite of this lesson.