A meaning of the Christian trinity: That a person is a process.
The Son of Man is a phenomenon taking place over thousands of years, the Holy Spirit is a cosmic procession and return, and the Godhead is an eternal process of creation. So what is a process of three separate processes? — Still one process.
So, too, does this reflect onto human personhood. The hexeity of every person, that essential being of each individual, that highest point of the self — is a process, not any kind of thing, material or conceptual. An essential movement of that process of subjectification is relating to God.