Kh. Frederica Mathewes-Green elaborates on the Great Canon of St. Andrew of Crete, a very repentant and soulful prayer that is also incredibly rich and complex. Her book on the subject, available in a variety of formats, can be found here.
Repentance is the tearing down of the wall that separates us from God. It is like the removal of a force-field which prevents us from entering His Kingdom. It begins