The mystery of the faith (το μυστηριον της πιστεως). "The inner secret of the faith," the revelation given in Christ. See for μυστηριον in Paul (2. Thessalonians 2:7; 1. Corinthians 2:7; Romans 16:25; Colossians 1:26; Ephesians 3:9).

In a pure conscience (εν καθαρα συνειδησε). See 1. Timothy 1:19. "The casket in which the jewel is to be kept" (Lock).