Bonaventure — on 2Cor 3:6 (Collations on the Hexaemeron, Collation 16)

“It should be noted that the Church was placed in paradise, like the first man, "to till it," in such a way that no one would say "that anything he possessed" was "his own." For it began in a state of great perfection that is observed today in the religious life, for the love of Christ was still recent, and in those days "a large number also of the priests accepted the faith." This Church, meaning the one that began with the Jews, because they were converted at one time by the three thousand, and at another, by the five thousand, possessed the "tree of life," that is, faith, because "My just one lives by faith." It also had the "tree of knowledge," that is, the Law, which remained with them for seeing and reading, and not for eating. Much more: for "the day you eat of it, you must die." And so you may see the tree of knowledge, but not eat of it, or else you would destroy what Christ had done; and death would necessarily come in, for "the letter kills." Hence Paul says: "I, Paul, tell you that if you be circumcised, Christ will be of no advantage to you."”