   A number of additional problems remain in accounting for Reid's appeal to common sense and in his treatment of first principles. For example, a number of comments Reid makes indicate that he appears to have a psychological conception of evidence whereby what is evident forces assent. He writes, “[The different kinds of evidence] seem to me to agree only in this, that they are fitted by nature to produce belief in the human mind” (EIP 2.20, 292). Just what he means, then, by terms “evident” and “self-evident” (terms he greatly prefers to the more contemporary “justification” and “knowledge”) is an issue meriting further research.