According to Popperian epistemology, there are no justified beliefs, only guesses that have been exposed to tests of some sort. I think David Deutsch has even

According to Popperian epistemology, there are no justified beliefs, only guesses that have been exposed to tests of some sort. I think David Deutsch has even used a formulation of words something similar to: "you shouldn't believe things". Isn't that a meaningless distinction? If I've tested my hypothesis, isn't "believe" perfectly fine as a label for how you think about it then? It is, but when people use that word they often have in mind that the source of the knowledge is important -- it isn't. I think that is what's behind most of the "I believe in Science" statements. What's really important is rather how vulnerable to attack an idea is. Edit: "believe in" also tends to get used with the implication that a time needs to arrive where you make a decision that a hypothesis is true. That also goes against Popperian epistemology, which says rather that all ideas remain subject to correction forever.