The title of the story refers to the philosophy of an obscure Jesuit theologian，Pierre Teilhard de Chardin。Teilhard offers a Catholic version of the science of evolution，theorizing that lower life forms evolved toward greater diversity and complexity，rising to the level of man，who exists at the midpoint between animal life and God。At this point，evolution continues — yet only on a spiritual level。Instead of diversifying biologically，humanity takes a path of convergence — that is，a path toward intersection or union — rising toward the unification of spirit in God。Referring to the Christian concept of revelation，Teilhard posits that at the end of time human spirit will have at last risen to the ultimate point of convergence，where all people are as one in Christ。