Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: A watan Fabrairun 1971, bayan wasan kwaikwayo guda daya a bikin Myponga Pop Festival a Ostiraliya, Black Sabbath ya koma ɗakin karatu don fara aiki a kan kundi na uku. Bayan nasarar da aka samu na Paranoid, an ba da band din karin lokaci na studio, tare da "akwatin da ke cike da tsabar kudi" don sayen kwayoyi. Ward ya yi bayani: "Muna shan cocaine sosai. "Kayan motsa jiki, masu kwantar da hankali, Quaaludes, duk abin da kuke so. Ya kai ga matakin da kuka zo da ra'ayoyi kuma ku manta da su, saboda kun kasance daga ciki. "An kammala samarwa a watan Afrilu na 1971, a watan Yuli ƙungiyar ta saki Master of Reality, watanni shida bayan fitowar Amurka na Paranoid. Kundin ya kai saman goma a Amurka da Ingila, kuma an ba shi takardar zinare a cikin ƙasa da watanni biyu, daga ƙarshe ya sami takardar shaidar platinum a cikin 1980s da Double Platinum a farkon karni na 21. Ya ƙunshi waƙoƙin farko na Sabbath, tare da ƙaunatattun magoya baya kamar "Children of the Grave" da "Sweet Leaf". Ra'ayoyin da aka yi a lokacin ba su da kyau, tare da Lester Bangs da ke ba da cikakken bayani game da Master of Reality a cikin Rolling Stone, yana kwatanta "Yaran Kabari" a matsayin "mai sauƙi, mai sauƙi, maimaitawa, cikakkiyar doggerel <unk> amma a cikin al'adar [rock'n'roll]... Ka'ida kawai ita ce tashin hankali, kuma Black Sabbath ta samu". (A shekara ta 2003, Rolling Stone zai sanya kundin a lamba 300 a cikin jerin 500 Mafi Girma Albums na Duk Lokaci.)  Tambaya: Menene ƙungiyar ta yi amfani da kuɗin da aka ba su?
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