I've extracted several sermons by James Durham on the nature of saving faith from his 72 Sermons on Isaiah 53 (starting to run low on the second printing of that book, and I won't be reprinting it--get it while you can). PDF of four sermons at the first link, raw text of 3 of the sermons on my PB blog.
James Durham | Naphtali Press
Who hath believed our report (Isa. 53:1): James Durham on the Nature of Faith - Blogs - The PuritanBoard
James Durham | Naphtali Press
Who hath believed our report (Isa. 53:1): James Durham on the Nature of Faith - Blogs - The PuritanBoard