Did not a blameless conscience stead me well -(I'd link to an online copy of the book, but I didn't like the one I peeked at as well as Sayers' translation)
That trusty squire that harnesses a man
In his own virtue like a coat of mail
A man can be paralyzed by an accusing conscience, where he otherwise acts freely and forthrightly when his conscience is clear. I like the turn of phrase here.