 There follow some commonsensical rules for handling opinions. For example, for a proposition to be accepted as true, it need not be necessary and the possibility of a proposition’s truth should not automatically lead to its acceptance. These rules are applied to evaluating claims of miracles. One should take care to evaluate all of the available evidence before accepting a particular claim. Outstanding authorities should be generally trusted. The miracles related by Augustine, for example, will be accepted as such by “a person of good sense” (IV.14, 267). In Chapter 15, the commonsensical principles for evaluating testimony are applied to some cases of then current interest regarding the disputed authorship of various letters and texts. Chapter 16 concludes the Logic with the topic of judgments regarding the future. The authors point out that it is a common error to overemphasize great future harms or benefits when these outcomes are very unlikely and to underemphasize small harms or benefits that are very likely or repeatable. Infinite benefits require a different strategy. The observation that the authors view as most important is the case made famous by fellow Jansenist, Blaise Pascal.