This book is Being and Time for therapists. It is dense and varied. Because it is the account of a series of seminars it lacks a cogent thematic approach which will put some readers off no doubt. However I see it more as a book to which you turn to from time to time - read small sections and then meditate on their implications for a while. I am pretty sure this will be a source of inspiration for many years. For a thorough and thematic treaty try Boss's book which came out of this process 'Existential Foundations of Medicine and Psychology'.