|Pentecost by Jean Restout|
Today begins the Pentecost Novena, modeling our own prayer after that of the Apostles who spent nine days praying for the descent of the Holy Spirit upon them. The prayers (found HERE) are relatively short and incredibly powerful.
Also, the New Theological Movement blog has a nice little write-up on novenas and the theology of the number nine HERE.
Veni, Sancte Spiritus!