 It has been noted that “[p]erhaps the greatest difference between a contemporary concept of causation and a seventeenth century concept is one of model. Following in Hume’s footsteps, contemporary philosophers customarily conceive causation as a relation between events (e.g., my flipping the switch caused the light to come on) while seventeenth century philosophers thought of it more as a relation among substances, their qualities, and their ‘powers’ (e.g., I cause my idea of justice)” (Frankel, 57).