Truth

"I always tell the Truth, even when I Lie" ~ Al Pacino film Scarface

What does it mean?

It's a great statement giving the speaker total freedom of expression.
No matter if he lies or if he tells the truth the statement remains true and the listener will never know if the statements made are true or false.

What is truth?
Truth means acceptable/ reasonable/ fair enough.
Human mind perceives truth by logical thinking.

Whether it may be a historical events, future prediction, mathematical proof, blind faith, etc, we need logical reasoning to be accepted as true.

Therefore, truth needs a condition.
What qualifies the condition is True and what disqualifies is untrue/ lie.

When we tell a story, it needs logical development to be true.
If the story is based on a hypothesis/ assumption, it is a lie, until the hypothesis is proved to be true.
Even if hypothesis is untrue, the lie can be logically developed as a true story.
"I always tell the Truth, even when I Lie" says it all.

Interesting to note, blind faith such as the concept of God cannot be proved, though it remains true.

Explanation:

God concept says, "God created Everything".
Even if I understand (stand-under) everything, I cannot know the God, because God is beyond everything.
Therefore, I have no evidence within everything to prove God.
In this case, I only can accept God as true, based on blind faith.

There is a way to prove God.
That is to overstand (stand-over) God, to observe God as evidence.
In this case, I can accept God as true, based on proof.

In Boolean  logic with base 2, truth is symbolized as 1. Untruth is symbol 0.

In fuzzy logic, combinations/composites of truths and untruths are layered multiple times to make confusion in logic in the range from truth to untruth.