The words in italics [in the 1888 book], and quoted, being of so much importance and involving so serious a charge against the papacy, ought to have a proper reference for them. WWPGC 15.4
Response: Criticism accepted. Wording corrected to that of L’Enfant in History of the Council of Constance, volume 1, page 516. WWPGC 15.5
1888 book read: “They brought forward arguments of great length to prove that he was ‘perfectly at liberty not to keep faith with a heretic,’ and that the council, being above the emperor, ‘could free him from his word.’ Thus they prevailed.” WWPGC 15.6
1911 edition wording reads: “They brought forward arguments of great length to prove that ‘faith ought not to be kept with heretics, nor persons suspected of heresy, though they are furnished with safe-conducts from the emperor and kings.’” Footnote reference given Lenfant, History of the Council of Constance, volume 1, page 516. WWPGC 15.7