I purchased the Summa for reference, having an interest in Theology. I consider myself an amateur Theologian the subject is to important to leave to the professionals! However I found the introdution absorbing and have read large portions of the book. Considering the time the Summa was written, that the book is abridged and translated I found it very readable. In particular the first section on God shows great insight and is still relavent to the modern mind, St Thomas teaches we can know God but not comprehend him. Being a Christian I found the book useful and deserves a place on any bookshelf.