"Missionary spirit is what makes the Curia evidently fertile and fruitful". If only it were true in the real world.
There's still too much proselytizing, conversion, and irreligious over-reach, ala "church militant", associated with "missionary spirit", even now - as, for example, represented in blatant militancy of Knights of Columbus.
Christopher Columbus was all about militant church/ state dominion and the religious/ political suppression of indigenous peoples globally. As a  55+ year member of the KofCs, i'm shamed to no end in the face of this reality.
If only the Curia and the KofCs were in fact "fertile and fruitful" in an authentically Christlike way, and not so male elitist!