The following is a review I wrote for my church magazine, Thomas Brooks is one of my favourite Puritans:
One of the greatest comforts for a Christian is that they are "accepted in the Beloved". It is not presumption or arrogance and we can say with Paul "But God forbid that I should boast except in the cross of our Lord Jesus Christ, by whom the world has been crucified to me, and I to the world." (Galatians 6 verse 14)
Thomas Brooks gives a thorough breakdown on the nature of assurance, why we should strive to attain it and how assurance renders burdens light.
Brooks was a learned man and he backs up his teaching with several Scriptures (this was a trait of the Puritans who were men of the Word). He also had an in-depth knowledge of the original Hebrew and Greek manuscripts. Here is an example:
"Oh but that glorious righteousness about which faith is conversant, is an unshaken righteousness, a righteousness which cannot be shaken: Psalm 36:6, "Your righteousness is like the great mountains," or rather, as it is in the Hebrew, "Your righteousness is like the mountains of God."
Brooks was also a scholar in ancient history and he frequently uses this to explain his teaching as shown here:
"What Alexander (the Great) said of his two friends, is applicable to many in our day; says he, "Haehestion loves me as I am Alexander--but Craterus loves me as I am King Alexander." One loved him for his person, the other for the benefits he received by him. So true Christians love Christ for his person, for his personal excellency, for his personal beauty, for his personal glory;"
In places this book is theologically very deep and as with other works by Thomas Brooks is not just to be read once but can be used as a reference book.