53 On this point he makes the wise remark that we ought not to desert the path mapped out by Christ and His Apostles, who, while regarding the Old Testament as preparing for and foreshadowing the New Covenant, and whilst consequently explaining various passages in the former as figurative, yet do not give a figurative interpretation of all alike. In confirmation of this he often refers us to St. Paul, who, when "explaining the mystery of Adam and Eve, did not deny that they were formed, but on that historical basis erected a spiritual interpretation, and said: 'Therefore shall a man leave,' etc."
Source: Spiritus Paraclitus (Vatican.va)