I once read that truth is the corolative relationship with reality and actions. So if your actions (thought, words and behaviour) is reflective of the reality of the situation then you have acted truthfully. If however, your perception of reality is flawed or different from the rest of the rational world, then ofcourse your truth would also be different. And you would then align your cognitive behaviour with this alternate reality. In other words truth is a realitive term, determined by majority conceptualisation.

In my humble opinion,
Fiya x

In the caribbean they have a saying "Rum done - friend done"
I should know, I'm from them parts :)