There is one theme played in three variations. Sometimes this leads to repetitiveness, but it more often displays new facets about this central theme.
Identity is the source of violence. It will always come from the outside, even when a radically free individual believes that they will shed all preconceived notions imposed on them and either find or construct their true selves. Identities might be the roles we play in society: father, son, ruler, servant, faithful, atheist, from this or that nation, etc. Once we recognize those are roles we play and not our essences, it's impossible to completely authentically return to playing that part. We can decide to embrace one of these roles, but the knowledge that this is not immutable will be there, latent. These identities put us on a collision course with others. It might lead us to hate others who do not share our identities, but even those sharing an identity might come into conflict while fighting for the same resources (material or not). Someone who follows a role model or master will seek to emulate them, but that also means desiring that others will see them as a role model themselves, creating competition between the followers and even between follower and master.
The recognition that those are socially imposed roles does not free the individual. It might give the freedom to change identities, to experiment and mix and match identities, but identity will inevitably come from the outside. Our "true self" is not a fixed thing nor a complete void, but we are "essentially" an ever-changing multi-splendored thing. At the end of the book, Douglas beautifully puts it as the realization that our internal chaos is the same as the mutable storm we see outside. The world changes and so do we, and the best we can do is to seek to emulate a model that allows space for this mutability, adaptability, that recognizes that the world is flowing and flows along with it.
These ideas are presented via the thoughts of Zhuangzi, Spinoza, and Girard. In each iteration we get a new perspective to them. In Zhuangzi we get the opposition with the fixed essentialist order of Confucianism, where a well ordered world would demand each one playing their roles to their full extent. Zhuangzi shows us a Dao that is in constant flux and asks us to embrace it. It's even interesting that taking the position of the sage who recognizes this and admonishes others for not following this position is also a reproachable position, as it assumes an identity of superiority.
With Spinoza we see that our essence is a Conatus that seeks to expand its own being, and that is what we deem "good." On a personal level, that leads us to seek exemplary models to show us what is good and seek to emulate them, but this eventually leads to vain glory and a social contract fixed so society can regulate the competition created by people desiring the same things as they emulate each other. Beatitude comes from seeing God (that is, Spinoza's God) as the model - a super-determinate being that is expressed but not determined by anything in its attributes and modes.
Similarly, Girard's theory of mimetic desire traces all non-essential desires to mimesis, to people copying their models, and desiring the same things creating conflict. Identity would surface as a way to create in-groups that can scapegoat their conflict by imputing blame to an out-group that can be sacrificed. The solution to the identity problem is to copy the desires of Jesus, not merely as a Christian following the Bible, but Jesus as the role mode who sought to be like the Father. Copying the indeterminacy of the Father would be beyond our capabilities, so the best we can do is mimicking the Son and unconditionally loving the Other's indeterminacy. It's wholly other and yet it is exactly the same as our own indeterminacy.
This book deeply fascinated me. Its subject matter is deep and well researched by a scholar and yet its prose is approachable and clear. It reads like a good friend doing his best to translate his deep knowledge to you. It recognized the challenges of escaping from identity, and yet it inspires one to also embark on this journey. It offers no clear cut solutions or an algorithm to follow so you can be like the Dao or reach beatitude, but it gives enough food for thought to put one on the path of trying to do so.
It can be "victim" to the Marxist insult of being idealist (in the philosophical sense), and placing the root of conflicts and violence in ideas instead of material conditions, but dismissing the book on these grounds would be very pedestrian. It even captures a sense that were the communist utopia be reached, it couldn't possibly mean the end of all conflict, as the mechanisms of identity and mimesis would still lead to conflicting desires and competition, no matter the abundance we might have. I'm not sure if it's possible to logically or scientifically prove this statement, but it has an intuitive sense of truth.
I would recommend this reading for anyone interested in any of the three thinkers and anyone open minded about shedding their identities and allowing themselves to be as ever-changing as the universe we live in.