Roger Nutt, Does Thomism Offer a Theory of Doctrinal Development?
Nutt refers the reader to Charles Journet's What is Dogma for a Thomistic explication of doctrinal development.
An excerpt: Dogma and Mystery
Here is my initial shot:
As we are unable to give a real definition of God in this life (as we do not know God as He is in Himself), so His essence has not been captured in a single concept. Hence He reveals Himself to us in a way that we can understand, through His actions and attributes (via analogy). Our understanding of what has been Divinely Revealed can be deepened as we apply our reason to it. (But it seems that our understanding can also be deepened in itself through participation in the Divine Life and the life of the Church? - through both experiential reflection and contemplation?)