One of the most classic works of philosophy of all time.
In this wonderful book, Erich Fromm explains how the two modes of existence, "having" or "being", struggle for the spirit of humanity. The mode of existence based on "having" leads man to endless selfishness, to constant anxiety lest he lose what he has or falsely believes he possesses.
On the other hand, the person who lives to "be" is independent, free, creative, likes to evolve, and for him love is a dynamic state of existence.
In the book "To Have or To Be?", Erich Fromm skillfully analyzes his thoughts, leading humanity to a psychological revolution: to compensate for the empty life that stems from "having" with a meaningful life that stems from "being".