Miracles describes the speaker's Catholic school training and how he moved from an unquestioning faith in the possibility of miracles to disbelief, and the mixed feelings of relief, guilt, and a sense of exile that accompanied this shift.
The poem describes how drinking skewed the speaker’s perspective on life (blurring night and day distinctions, etc.) and isolated him from others. The poem goes on to illuminate the speaker’s recovery, the result not of an Alcoholics Anonymous-type "higher power" but of the speaker’s own dark epiphany: "I recognized the night as night and chose it."
