St. John Chrysostom 
Two Sermons on the Consolation of the Dead [EPUB ebook] 

These two sermons address the concept of sadness, particularly in the context of death, and distinguishes between two types: godly sorrow that leads to repentance and worldly sorrow that brings death. It reflects on the inevitability of death as a divine decree and reassures believers of the hope of resurrection through Christ. The text cites biblical examples, including King David’s response to his son’s death, to illustrate appropriate mourning and the importance of maintaining faith. It concludes by affirming the transformative power of resurrection, urging Christians to embrace hope rather than despair.