 In other words: every full belief must have stably high conditional degree of belief, at least when conditioning on propositions which are not currently disbelieved. Since full belief occurs on both sides of the biconditional, it is evident that this is not a proposed  reduction of full belief to partial belief, but rather a constraint that every rational agent must satisfy. The Humean thesis leaves the precise threshold \(s\) unspecified. Of course, for every \(\frac{1}{2} \lt s \lt 1,\) we can formulate a specific thesis \(\text{HT}^s\) in virtue of which the thesis is true. For example, \(\text{HT}^{.5}\) requires that every fully believed proposition remains more likely than its negation when conditioning on propositions not currently disbelieved.