 For many, sacrificing deductive cogency is simply too high a price to pay for a bridge principle, even one so simple and intuitive as the strong Lockean thesis. That occassions a search for bridge principles that can be reconciled with deductive cogency. One proposal, due to Leitgeb (2013, 2014, 2017) and Arló-Costa (2012), holds that rational full belief corresponds to a stably high degree of belief, i.e. a degree of belief that remains high even after conditioning on new information. Leitgeb calls this view the  Humean thesis, due to Hume’s conception of belief as an idea of superior vivacity, but also of superior steadiness. See Loeb (2002, 2010) for a detailed development of the stability theme in Hume’s conception of belief. Leitgeb (2017) formalizes Hume’s definition, articulating the following version of the thesis: