IntheBookofPropheticEthicsandtheCourtesiesofLiving(KitabAdabalma'ishawa-akhlaqal-nubuwwa),booktwentyofthefortybookswhichcomposetheRevivaloftheReligiousSciences(Ihya''ulumal-din),Abuhamidal-GhazaligivesafullaccountofthecustomsandcharacteroftheMessengerofGod,Muhammad.ItisnotabiographyofMuhammadbutaroadmapforthosewhowanttostrengthentheirfaith,increasetheirknowledgeanddeepentheirunderstandingofthesecondpartofthetestimonyoffaith,namelythefirstpillarofIslam.TheauthordetailstheMessenger'snoblenatureandhismiracles,whileremovingdoubtsregardinghismessage.HedealswiththeissueoftheimitationofMuhammadnotingthattheultimatesourceofknowledgeisrevelationfromGodwhichcomestousthroughtheMessenger.Therevelationservesasmedicinefortheheartandisessentialforhumansalvation.Themessengersarethedoctorsoftheheartwhoseprescriptionsmustbefollowed.Theyarespiritualguidesforthepurificationoftheheartandfortransformingbasequalities.ThemessengersofGodarenotmerelysourcesoflawthataimtogovernthebody;indeedtheyareafountofspiritualnourishmentforthesoul,theheartandthemind.ThisvolumelaysclearthattheaimoftheimaminthisSeriesistocallforareturntotheSunnaandtheimitationoftheMessengerinallaspectsoflife.Thefocusisontheactswhichdirectlyinfluencetheheart;heprovidesthereaderwiththenecessaryknowledgethatmakesupthepathleadingtotheHereafter.Al-Ghazaliconcludesthatforhimthetruthandvalidityoftherevelationisverifiedbythemoralinfluenceitexercisesontheheart,mindandultimatelyonthesoul.Abuhamidal-Ghazali(d.1111)wasaleadingscholar,jurist,andtheologianofthegoldenageofIslam,andheremainsitstruestadvocateinmoderntimes.