 The principles KB1 and KB2 were introduced by Hintikka, who endorses both Hintikka (1962) noting that Plato is also committed to KB1 in Theatetus. The first principle, KB1, captures the intuition that knowledge is a stronger notion than belief. The second like 4 and 5captures the idea that one has privileged access to one’s own beliefs. The third, stemming from Lenzen (1978), captures the notion that beliefs are held with some kind of conviction: if something is believed, it is believed to be known.