This adjective precedes "grace" in the name of a hymn
proper name, literally "favor, grace;" see 
grace (n.)... [DOC] [TLE] Merciful (Adjective, and Verb, to Be), Mercy (Noun, and Verb, to ... [PAR] Merciful (Adjective, and Verb, to Be), Mercy (Noun, and Verb, to Have, Etc.)