Wikipedia:Saying something doesn't make it so

On Wikipedia, at least, simply saying something doesn't make it so. This applies to disagreements and arguments, both to content and sources.

IRL, we can often see that saying something doesn't make it so: no matter how much an adult wishes to be six foot five (or five foot six), one is stuck with the height one is at.

In regards to content, no matter how much one believes something, Wikipedia requires verifiable sources. See WP:V and WP:C. We are not documenting our personal beliefs, but those published in sources. Most likely, if you as an individual believe something, you can find a source which believes the same, or which documents others having that belief. This is much more convincing than simply repeating an assertion over and over.

In regards to sources, no matter how much one believes something, if another editor or editors add cited content which disagrees then you have two options.