L'article de la Catholic Encyclopedia abonde pourtant dans votre sens :

As has been said, the simplest explanation of the Christmas novena is the nine months of Christ in the womb. But for every novena of preparation, as also for every novena of prayer, not only the best explanation but also the best model and example was given by Christ Himself to the Church in the first Pentecost novena. He Himself expressly exhorted the Apostles to make this preparation. And when the young Church had faithfully persevered for nine full days in it, the Holy Ghost came as the precious fruit of this first Christian novena for the feast of the establishment and foundation of the Church.

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