 Thus, the custom or habit to make the inductive inference not only gives rise to a new idea of not yet observed instances resembling the instances we have already observed, it also produces a feeling of determination to make the very inductive inference in question. This feeling of determination, in turn, gives rise to a further new idea, the idea of necessary connexion, which has no resemblance whatsoever with anything we have observed. It is derived from an “impression of reflection” (an internal feeling or sentiment), not from an “impression of sensation” (an observed instance before the mind), and it is in precisely this sense, for Hume, that the idea of necessary connection is merely subjective. Hume emphasizes that this is a “discovery” both “new and extraordinary”, and that it is skeptical in character (EHU 7.28–29; SBN 76): 