Before you make a testimony as a witness in a courtroom, you are told to tell the truth, the only truth and nothing but the truth.
Well, that begs for the question: What exactly is the truth?
I think truth is a personal interpretation. A statement is made in a neutral format and whether it is the truth or a lie depends completely upon the interpretation of the individual viewing upon that. Superstitions are the best example. 'It is bad luck to open an umbrella indoors'. That statement is neither true or false in it's original claim. It is only true for those that believes in it's truth and as false for those that believe it is so.
A statement will become the truth or a lie.
So in court, the truth is unknown. It is based on the interpretation by the jury and judge on the 'facts' presented, that we then make a conclusion. It is through this process that we make errors, sending innocent people behind bars and letting the genuinely guilty ones free.
But it begs for the statement in question:
"A truth is always the truth even if nobody believes it. A lie is always a lie even if everyone believes it."
Now what about you?