Ratzinger writes about Bonaventure's concept of "revelation".
"Revelation" is the result of an inspired capability to recognize the truth beneath the "veil" of the scriptural "letter". Thus an inspired hermeneutics (the ability to interpret aright) = revelatory vision.
Counterpointed by humility - exemplified by St. Francis, whose approach was to live out the Sermon on the Mount "sine glossa" (without "glosses" or special interpretations) - ie., simply, literally, taking Christ's commandments at face value.
Since Joachim & Bonaventure (in very different ways) expected the working-out of salvation history as the increasing influence of the Holy Spirit in the world, by way of "spiritual" (contemplative)