This collection of works by the Persian church father includes a letter to St. Gregory of Armenia discussing the multifaceted nature of fasting, illustrating that true fasting is not limited to abstaining from food and drink, but also involves moral and spiritual discipline. It cites biblical figures who exemplified holy fasting through their faith and purity. The text stresses that genuine fasting requires heartfelt holiness and a commitment to abstaining from harmful words and deeds. It concludes by urging the reader to cleanse themselves spiritually before partaking in communion, reinforcing the idea that one's words and actions must align with their fasting practices.