 A review of the relevant psychological literature will reveal further criteria that could be employed to identify good and bad conditions for Platonic intuition while thought experimenting. Yet, proponents of the naturalistic version of the intuition–based account wonder how necessary Platonism is once this move is entertained in defence of the reliability of intuitions (see Miščević 2004). Elke Brendel defines intuitions as mental propositional attitudes accompanied with a strong feeling of certainty. In her view, we can tell two stories to make sense of their cognitive power and plasticity. One story relates to our biological constitution and evolutionary past. The other is about membership in specialized communities. Brendel’s account raises many questions, but it is difficult to resist its appeal. A universal set is appealing to anyone not trained in logic because most things we are familiar with can come in sets, such as books, tables, and philosophers. A set of all sets seems intuitively plausible. The intuition disappears once you worked yourself through the problems arising from the idea of a set of all sets. Brendel is quick to insist that such relativity of our intuitions doesn’t imply that they are cognitively useless. Without intuitions, we probably wouldn’t have knowledge, and thought experiments are sometimes the only way to access the intuitions that guide us in our cognitive lives. (see Brendel 2004)