The Service of the Small Paraklesis (Intercessory Prayer) to the Most Holy Theotokos
http://www.goarch.org/chapel/liturgical_texts/paraklesis
I haven't done this for a long time!! It takes about an hour to read or chant, it seems rather long at times but is so effective & soothing to the spirit. Oh Panagia, please help us & heal us all. I love thee!
