You probably will be wondering if truth-saying needs a methodology.
Truth-saying has always been methodological and scientific. People simply ignore the methodology.

Your capacity to say exactly what you see is what I want to reason with you and show you there's actually a method in truth-saying.

What is "Truth"? This is the greatest question ever asked. I think Pontuis Pilate asked Jesus that question too. And Jesus didn't reply. Well, we're not discussing "Truth" but "truth". What's the difference? The capital Truth is inaccessible to reason. Some call it God. No human knows it in a perfect way. It is kind of the answer to the deepest question of existence... Like: how did the Bing Bang started? Why are we on earth? Why is it that, of all the animals that have ever existed on earth, it is man that discovered Reasoning? etc.

But the small truth is the truth that depends on us. We kind of invented them. Actually if you're God, this truth might not make sense to you. For instance 1 +1 = 2.
Now calm your brain and reason this. Do you know that from the number 2 to infinity don't exist? Their existence is what Emmanuel Kant called a "necessary mistake". Why is it that they don't actually exist? Because everything that exists is unique in it's existence. You say 2 mangoes, 5 chairs, etc. But make a critical observation of those things and you'll realise no 2 things are perfectly identical. The proof is the fact that you say 12 mangoes yet when allowed to chose 1 mango from among the mangoes, you become selective. If the mangoes are 100% equal to themselves, you're not supposed to chose one over the rest. You would just pick whatever mango that your hand touches first. Humans invented numbers to easily manipulate things in an intellectual way.
Another form of the small truth is in nomination. Do you know, all names that have ever been given don't actually exist. Man invented them. Who knows, God who created the world probably don't use words like: "Goat", "Man" "Water", etc. Man invented names to avoid confusion when discussing with others. If you exist alone, you'll never have a need to invent a name for a dog or a goat. You just know them by their character. But when you need to discuss with someone about animals, you definitely need to know the names of the animals you are talking about to avoid confusion. Imagine that you want to talk to someone about dog and say "the animal that shouts". Tomorrow the person might see your Dad shouting at a dog and think you were talking about your Dad the other day.

The main knowledge I want to share about truth is on the nominal truth... The truth derived through the names of things. The methodology behind this truth is that you name the thing through what it exhibits. If I should formulate the methodology, I'll say "the thing makes the name, the name doesn't make the thing."
You can't get someone, NAME them "footballer" and automatically have them playing good football like Leo Messi. No. They must be playing football first before we call them Footballer. What does it tell you? The thing makes the name, the name don't make the thing.


Now join me in this reflection. If someone who is swimming is called a swimmer and someone who is playing a guitar is called a guitarist, would you see a man swimming and call him a guitarist? Very silly question, right? But you just shot yourself on the foot by admitting it's a silly question.
Haven't you ever seen someone bombing people and call them Muslims instead of calling them bombers (or terrorists if I should sound formal)? Haven't you ever seen someone taking bribe and call them "Lecturer"? instead of calling them "bribe-taker"?
A Muslim is someone that adheres to the Islamic religion not someone that adheres to bombing people. A Lecturer is someone that gives lectures not someone that takes bribe.

If you see a Muslim killing someone at a moment "T", give him a name that concord with what he is doing at that moment "T". Call him a Killer. If you continue to call him a Muslim at that time T, your nominal truth will be considered absurd. It'll be like meeting Pope Francisco and calling him a Bouncer because you know him as a bouncer some years ago. Call him what he is now - Pope.

So when you want to say the nominal truth about a thing, forget about the "Yesterday" or the "Tomorrow" of the thing. Name the thing in accordance with what it exhibits. This is the almighty formula for truth-saying.
It's called Phenomenology.