I Swear to Tell the Truth, Unless It’s Wrong, So Then It Wouldn’t Be the Truth, But That’s a Major Issue, And I Just Confused Myself...Again

The truth, the truth, and nothing but the truth. 

There are generally three sides to a story: your side, my side, and the truth. 

But what is the truth? Here's an easy one - a proven fact. But what defines proven facts? Sure, we have our science, but humans make mistakes all the time. How do we know that some of our most basic, commonly accepted ideas are true? We don't, at least, not really. With regards to the truth, there are infinite interpretations of an event, and they could all be partially true. So what is the truth?