Why Boston?
Next to the study of God , perhaps no greater is the study of man. In is work of the Fourfold State of Man which is 500 plus pages no one compares to Boston. Here's a quote:
If there is one book that more than any other stands out as representative of the best of our Scottish religious classics it is Human Nature in its Fourfold State,' says John Macleod in Some Favourite Books. In Boston's most famous work he expounds the biblical teaching on the four different "states" of man's relationship with God - innocence, sin, grace, and glory. So basic is his material, and so thorough his presentation of it, that this book speaks to the spiritual needs of every reader. For those who ask about the origin and meaning of human existence, Boston provides the biblical answer; for those who are confused about the biblical gospel, Boston explains its meaning and power.
http://www.logos.com/product/8525/the-whole-works-of-thomas-boston