The episode title is excerpted from a quote from Mary Shelley's novel 'Frankenstein' - "... it seems to me as if this [...] was the immediate suggestion of the guardian angel of my life--the last effort made by the spirit of preservation to avert the storm that was even then hanging in the stars and ready to envelop me [...].
It was a strong effort of the spirit of good, but it was ineffectual. Destiny was too potent..."