Edmund Gettier called into question the theory of knowledge and the traditional definition of knowledge. Gettier's argument is that there are situations in which one's belief may be justified and true, yet fail to count as knowledge. He contended that while justified belief in a true proposition is necessary for that proposition to be known, it is not sufficient. According to Gettier, there are certain circumstances in which one does not have knowledge, even when all of the above conditions are met. Gettier proposed two thought experiments, which have come to be known as "Gettier cases," as counter examples to the classical account of knowledge. He argued it is possible to arrive at an assumption based on belief which is deemed justified, but happens to be true only by chance, because the outcome was predicted for the wrong reason and so can't be classed to be knowledge.
The conclusion is written in one paragraph and its main purpose is to sum up the arguments of the essay, which the author revealed in the topic sentences of the body paragraphs. It summarizes the evidence in support for the thesis statement of the essay and if proved restates this statement. It is a final glance at the presented facts, which lead to a certain conclusion on the essay matter.
The conclusion does not have a set structure and can be written according to the peculiarities of the essay but must always have the mentioned above argument summary analysis.