I believe that such standard dictionary definitions of acedia as “apathy,” “boredom,” or “torpor” do not begin to cover it, and while we may find it convenient to regard it as a more primitive word for what we now term depression, the truth is much more complex. Having experienced both conditions, I think it likely that much of the restless boredom, frantic escapism, commitment phobia, and enervating despair that plagues us today is the ancient demon of acedia in modern dress. The boundaries between depression and acedia are notoriously fluid; at the risk of oversimplifying, I would suggest that while depression is an illness treatable by counseling and medication, acedia is a vice that is best countered by spiritual practice and the discipline of prayer.”
Kathleen Norris, Acedia and Me