How bizarre is it that I've read this paper before. I think it's provocative, but, this not being my field, I don't know what effect it had.

It's one of the most influential papers in epistemology. The paper gave rise to the notion of the "Gettier problem" for the otherwise appealing view that knowledge is justified true belief. A great deal of epistemology since can be understood as trying to figure out what to add to the "justified true belief" theory to get around Gettier-style objections.

Also interesting, it seems to have been basically the only thing he published, and he published it mainly because he had to publish something.