 Coherentists reject two related features of the picture of evidential reasons that underlies Agrippa’s trilemma. The first feature is the idea that justification is an asymmetrical relation: if a belief \(p_1\) justifies a different belief \(p_2\), then \(p_2\) does not justify \(p_1\). The second feature is the idea that the unit of justification is the individual belief. Putting these two rejections together, the coherentist believes that justification is a symmetrical and holistic matter. It is not individual beliefs that are justified in the primary sense of the word, but only complete systems of beliefs—individual beliefs are justified, when they are, in virtue of belonging to a justified system of beliefs. The central coherentist notion of justification is best taken to be a comparative one: a system of beliefs B1 is better justified than a system of beliefs B2 if and only if B1 has a greater degree of internal coherence than B2. One crucial question that coherentists have to answer, of course, is what it takes for one system of beliefs to have a greater degree of coherence than another. Many coherentists have thought that explanatory relations will be crucial in elucidating the notion of coherence: the more explanatorily integrated a system is, the more coherence it displays (see Quine &amp; Ullian 1970 [1978] and BonJour 1978).