Therefore, I must leap across this wall of invisible vision to where you are to be found. But this wall is both everything and nothing. For you, who confront as if you were both all things and nothing at all, dwell inside that high wall which no natural ability can scale by its own power.
(p. 256)
For the wall shuts out the power of every intellect, although the eye looks beyond into paradise. Yet that which the eye sees it can neither name nor understand; for what is seen is the eye's secret love and a hidden treasure, which remains hidden after having been found, because it is discovered inside of the wall of the coincidence of the hidden and the revealed.
(p. 269)
The posse {i.e. potential} of the mind to see, therefore, surpasses the posse to comprehend...
This posse of the mind to see beyond all comprehensible faculty and power is the mind's supreme posse. In it Posse Itself {i.e. God in His Unbounded Potentiality} manifests itself maximally, and the mind's supreme posse is not brought to its limit this side of Posse Itself. For the posse to see is directed only to Posse Itself so that the mind can foresee that toward which it tends, just as a traveler foresees one's journey's end so that one can direct one's steps toward the desired goal.
Therefore, think over these matters that you may see that all things are so ordained that the mind could run toward Posse Itself, which it sees from afar, and comprehend the incomprehensible in the best way it can. For Posse Itself, when it will appear in the glory of majesty, is alone able to satisfy the mind's longing. For it is that what which is sought.
(pp. 297-298)