This is very far from being a conventional time management book. It is much better than that. You will not find 'seven steps to taking control of your time' or anything like that.
Jacob Needleman is a highly regarded philosopher and this is a serious work of philosophy, with strong overtones of Taoist or Zen approaches. Like those, it is a practical guide, but not the sort of easy guide that is most commonly found in the management literature.
It is based on the distinction between the Ego and the Self and argues that our crisis of business and stress is closely related to neglect of the search for the Self. The author's practical advice is built around developing a habit of mind that gives honour to reflection and a degree of detachment.
There is, of course, much more in this short book than that. There are times when one wonders whether the narrative is leading anywhere, followed by flashes of recognition. It is well worth considering if you are open to philosophical and sometimes counter-intuitive guidance. Certainly, it helps to show that the approach to 'time management' of relentlessly increasing your efficiency at filling your day with more things is inevitably counter-productive, and it offers a difficult but practical alternative route to a sane outlook and a sane life.