The Bane of Tongue (Kitab afat al-lisan) is Book 24 of the Imam al-Ghazali’ s magnum opus, I?ya? ?ulum al-din, The Revival of the Religious Sciences. Within the architecture of this monumental work, Afat al-lisan is the fourth book of the third quarter, The Ways to Perdition (Rub? al-muhlikat), in which al-Ghazali sums up in ten books (or chapters) all the human shortcomings and vices traditionally believed to lead a person into a state of loss in this world and the Next, and which in certain respects overlap with the Judeo-Christian notion of the seven deadly sins.In Book 24, al-Ghazali divides the banes (afat) or defects of the tongue, from the least to the most offensive, into twenty short chapters, each of which comprises a psychological/spiritual analysis of how and why the particular defect might exist in a person’ s soul, examples of how it manifests itself in behavior, and practical suggestions for eliminating it from one’ s personality. The misuse of the gift of speech and language is certainly not something new, as this work, composed nearly 950 years ago, amply shows, but in this age of internet-based communication, it has taken on a new and more destructive dimension.