 Pruss responds that being self-evident is not incompatible with providing arguments for self-evident propositions, and he thinks that arguments can show the truth of the PSR to those who deny its self-evidence. Among the numerous arguments he advances is a modal argument employing a Weak Principle of Sufficient Reason, according to which “every contingent proposition possibly has a complete explanation” (Pruss 2006: 234–35). We will develop this in  section 6.