From the Orthquote list, 18 Nov 2006:
From St. John of Kronstadt (My Life in Christ; Holy Trinity Monastery pg. 174):
“Prayer is spiritual breathing; when we pray we breathe in the Holy Spirit; “praying in the Holy Spirit” (Jude 1:20). Thus, all church prayers are the breathing of the Holy Spirit; as it were spiritual air and also light, spiritual fire, spiritual food and spiritual raiment.”