Vos's Metaphor for Progressive Revelation

The way Geerhardus Vos metaphorically describes progressive revelation and the relationship between the Testaments:

Old Testament prophecies and texts are like seeds and later Old Testament and New Testament understandings of the same texts are like plants growing from the seeds and flowering; from one angle the full-bloomed plant may not look like the seed (as in botanical comparisons), but careful exegesis of both Old and New contexts can show, at least, some of the organic connections.

--Quoted in G.K. Beale, We Become What We Worship: A Biblical Theology of Idolatry