From this text I take away the principle that generally one "becomes an I through a You," though "only an It can be put in order. Only as things cease to be our You and become out It do they become subject to coordination."
Heavy on abstraction, but written in a lively manner. Does not use the more recent citation-heavy style, but refers to other writers obliquely, if at all. The third part is specifically theistic, which is not for me, but it's got a lot of cool insights, such as how our "religious situation, existence in the presence, is marked by its essential and indissoluble antimonies. That these antimonies are indissoluble constitutes their very essence." Great introductory essay by Kaufmann.
Recommended for those who know confront each other freely in a reciprocity that is not involved in or tainted by any causality.