Reference for this "New is in the Old Concealed" quote that is attributed to Augustine? I've seen the quote, "The New is in the Old Concealed, the Old is in the New Revealed" (such as a question here or the second answer here) or a variation, "The Old Testament is the New Testament concealed, and the New Testament is the Old Testament revealed" (such as in this answer) and I have typically seen this attributed to Augustine, though I haven't found its source.  I have only found these two related but non-identical statements of St. Augustine from "On the Spirit and the Letter." 


  "This grace hid itself under a veil in the Old Testament, but it has been revealed in the New Testament" (from chapter 27)


and 


  This is the righteousness of God, which was veiled in the Old Testament, and is revealed in the New (from chapter 18)


I actually originally heard this from a Chuck Missler presentation without attribution. And at this Ligioner ministries article, and many others, it is attributed to Augustine. 

Where does this quote come from?
“In the Old Testament the New is concealed, in the New the Old is revealed” (Novum Testamentum in Vetere latet, Vetus Testamentum in Novo patet) literal: New Testament in the Old lies, the Old Testament in the New is clear. St. Augustine, Quaest. in Hept. 2,73: PL 34, 623; cf. DV 16.

In case the reference needs decoding; Quaestiones in Heptateuchum VII (Seven Questions Concerning the Heptateuch) Dated AD 419-420.