Illustrate a scene adhering to the biblical reference from Acts 4:31. Show an ethereal gathering spot, most likely an olden-style room, as it's suddenly filled with an unseen but powerful force, causing a discernible shake. The room's occupants, a diverse mix of individuals, are all visibly engulfed in a divine glow, signifying the presence of the Holy Spirit. They're shown passionately communicating, no text but their expressions radiating fervent dedication and fearlessness, indicative of the word of God being spoken boldly. The entire image is to be rendered in the style of a watercolor painting.