Wikipedia is an encyclopedia, not a publisher of original thought. The threshold for inclusion in Wikipedia is whether material is attributable to a reliable published source, not whether it is true. Wikipedia is not the place to publish your opinions, experiences, or arguments.
Although everything in Wikipedia must be attributable, in practice not all material is attributed. Editors should provide attribution for quotations and for any material that is challenged or likely to be challenged, or it may be removed by anyone at any time. The burden of evidence lies with the editor wishing to add or retain the material. If an article topic has no reliable sources, it should be deleted.
Wikipedia:Attribution is one of Wikipedia's central article policies. Together with Wikipedia:Neutral point of view, the two determine the type and quality of material that is acceptable in articles; that is, content on Wikipedia must be attributable to reliable sources and written from a neutral point of view.