In The Bride of The Lamb, Sergius Bulgakov argues that the church itself should be undestood as the fulfillment of God’s plan of salvation, but in a particular sense. The church is an entelechy, a term that takes its derivation from Aristotle’s Metaphysics. Therein Aristotle defines an entelechy (from en+telos) as a reality that has its own end within itself and as such is constantly in a state of becoming that is, by definition, unending, for if an entelechy were to acheive its end in a static sense it would cease to exist.
Bulgakov applies this to the church. The church is within itself the eschatological fulfillment of redemption, but it is always and ever in the process of becoming this reality. Here we have a fruitful concept, not only for thinking of the church in the present age as always en via, but also for a mode of thinking about the age to come. If the people of God are defined by there entelechic mode of being in which they are always dynamically becoming that which they are without ever acomplishing this identity in a static sense (which would be a contradiction), then we are now able to conceptualize eternity, not as a sort of fiat accompli, but rather as an ever-moving restfulness, an ever-peaceful exhilaration which never comes to an end and eternally grows more exciting.