The image immediately to the right as one faces the main altar is a scene from the Acts of the Apostles (Acts 1:12-14; 2:1-4): the Sunday of Pentecost, when the Holy Spirit appeared visibly as in countless tongues of fire and rested upon the Blessed Virgin and the Apostles. This same Spirit is given to us sacramentally in Confirmation. Cited in the inscription is a scripture antiphon that’s been used at Mass on the Day of Pentecost since the 3rd century (Wisdom 1:7): The Spirit of the Lord fills the whole world.