Having finished Volume 2, I've moved on to Volume 3 of Pelikan's Christian Tradition: The Growth of Medieval Theology. I highly recommend the set so far. I've read a lot of Church and Christian history, but this treatment of the history of doctrine is by far the most intelligent and profound treatment I've ever encountered. It enriches one's knowledge of God, rather than merely relaying the facts of history. Pelikan himself offers great insight into Medieval ideas such as on grace:
"it was the doctrine of the person and work of Jesus Christ, rather than the doctrine of justification or even the doctrine of grace, that became the principle vehicle for affirming the character of salvation as a free and utterly unearned gift of God." -Jaroslav Pelikan pg 116.
Pelikan also offers some other gems from medieval theologians I've liked:
"When we pray, we speak to God. But when we read [Scripture], God speaks to us" - Adalger
"To eat his flesh and drink his blood means that one abides in Christ and Christ in him." - Radbertus
"On has to ask whether we are to adore or worship anything except true God. If not, the inference must be drawn: 'How is it that you worship the Son of the Virgin if He is not true God?'" -Alcuin
"Ignorance of the Scriptures is ignorance of Christ." -Julian of Toledo
"all effort of human argument must be postponed were faith alone is sufficient...The righteousness of faith by which we are justified [consists in] that we believe in Him whom we do not see, and that, being cleansed by faith, we shall eventually see Him in whom we know believe." -Julian of Toledo