  Perhaps the psychological view that Spinoza introduces at IIIp28 is susceptible to the sort of objection which one might raise against psychological hedonism, the view that human beings only desire pleasure, the avoidance of pain, and what is instrumental to these things. It may seem to some people that IIIp28 is not consistent with their own experience of their motives in acting. So, someone with a strong sense of justice might say: 