Here's why:
* Truth is already definitive: Truth is the opposite of falsehood or illusion. It's a state of being aligned with reality, and there's no need to add "actual" to emphasize that it's the real deal.
* Redundancy: The word "actual" is used to indicate something is real or true as opposed to something that is not. Using it with "truth" is therefore redundant because "truth" already implies reality.
However, there are a few situations where "actual truth" might be used:
* Emphasis: Sometimes, using "actual truth" can be used for emphasis, particularly when highlighting the difference between something perceived as true and what is truly the case.
* Specificity: In some contexts, "actual truth" could be used to distinguish the real truth from a hypothetical truth or a different kind of truth (like a metaphorical truth).
In most cases, "truth" is sufficient and more concise. Using "actual truth" might even come across as unnecessarily wordy or repetitive.