I have recently acquired some volumes of the Works of Thomas Goodwin. These seem to be a very valuable collection; volume 3, in particular, seems to have some real gems in it, I enjoyed reading his short work
The Vanity of Thoughts Discovered, and am currently making my way through
A Child of Light Walking in Darkness. What I particularly like about the latter book is that the short chapters mean that readers who do not have a lot of time on their hands can throughly digest what the author is saying in a chapter without having to stop when you are partially through it. Often I lose out when reading Puritan works, as I would need to set aside an entire day to fully read and digest a chapter. Furthermore, A Child of Light Walking in Darkness is an excellent treatment of the doctrine of assurance; from memory (I read this about 6 years ago) Joel Beeke heavily relied upon it when writing his PhD
A Quest for Full Assurance.