Chapter 24 examines the records of the Tridentine discussions of justification which took place over the period 22–28 June 1546. These discussions indicate how the basic agenda was set, and how a number of approaches were explored, before the final structure of the Decree on Justification was developed. These discussions are of major importance in interpreting the final Decree on Justification, as they often indicate why a particular form of words was adopted in preference to another. Perhaps the most important of these is the revised version of the eighth chapter of the draft decree that was drawn up for discussion on 11 December 1546, concerning the formal cause of justification. The original wording recognised that there was una (‘one’) such cause. This was considered to allow that other formal causess might also be countenanced, and so was replaced by unica (‘single’, ‘sole’ or ‘one and only’).