 Meyerbeer 's personal attachment to Judaism was a mature personal decision – after the death of his maternal grandfather in 1811 he wrote to his mother ' Please accept from me a promise that I will always live in the religion in which he died ' . In his diaries he noted significant family events including <unk> , not by their Gregorian calendar occurrence , but by their Jewish calendar dates . Moreover , he regularly suffered from ( and / or imagined ) anti @-@ Jewish <unk> throughout his life , warning his brothers frequently in his letters against <unk> ( Yiddish for ' Jew @-@ hatred ' ) . Writing to Heinrich Heine in 1839 , he offered the <unk> view : 
