In his treatise Contra Gentiles , Athanasius reproduces an argument from the Phaedrus that provides the immortality of the soul.  Anything that has to be moved by something else is mortal and finite; whatever moves of itself is immortal, and immortally mobile.  What is most fully mobile is what is unoriginated and imperishable.
Likewise, in the Sophistes , Plato says that the realm of being is the realm of life and movement.  That is, the realm of ideas is not static, but supremely alive and active.
Peter Leithart
Peter J. Leithart is President of Theopolis Institute. He is the author of numerous books on theology, literature, and culture, including Theopolitan, Defending Constantine, and Baptized Body.
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