Just saying something is true doesn't make it so. Truth requires justification, and if you can't provide that, then there's no reason to believe it's true. For

Just saying something is true doesn't make it so. Truth requires justification, and if you can't provide that, then there's no reason to believe it's true. For someone making a claim, the onus is on them to provide evidence. Otherwise I'll just say I'm right and you're wrong, after all, that's what you're saying.