Time and eternity were, from the outset of our tradition, the object of great debates which have lost none of their import. The words “time” and “eternity” themselves are notoriously in constant need of strict definitions and clear, critical consideration to avoid oversimplifications; confusion concerning their exact meanings may easily lead into the kind of hazy thinking and inaccuracy by which many a page of contemporary popular works on the subject is flawed. This chapter considers some of the problems and some of the distinctions and clarifications that people owe mainly to the ancient Greek philosophers, steering away from most of the vast secondary literature on the subject in order to bring out just a few essential aspects that can still greatly enlighten them. It proposes: The “Now” of Time’, The “Now” of Eternity’, and Time, Eternity and God.