Seraphina derives from the Hebrew seraphim, often translated as "the fiery ones," referring to a high order of angelic beings associated with burning devotion. The name is commonly read as carrying intensity and ardor -- passion understood as a kind of luminous energy rather than something to be tempered or subdued.
Mercury can be used for one thing and its contrary because it is of a variable nature. - Picatrix (Andalusia, ~1000.AD)