A very lithe intro into the subject on how to live authentically. Written in 1972 this is still powerful book. Details how little philosophy has actually shifted in the intervening period as much of what he details is highly relevant in an era of hyper capitalism and the desire to immerse the self in objects during an era of sustained growth was a cultural norm. Then it mattered little what was authentic because the culture of excess in the West ensured that everyone could dip into various forms of alienated life to gain freedom from consumption.
The notion of finding the self was just another discourse, highlighting the high degrees of alienation or undiagnosed and untreated forms of autism that were reified into a cultural norm.
This slim volume is a bluffers guide except it is also an intellectual tour de force detailing all the main theorists; Nietzsche, Heidegger, Sartre, Buber, Tillich, Kerkegaard Jaspers, Husserl amongst others.
Chapters divided into Existential Philosophising, Idea of Existence, Existence ad the World, Feeling, Attitude, In Quest of the Authentic Existence, History and Society, The Arts plus numerous other insights it offers a comprehensive insight.
If you wish to start an inner journey this provides a first step.