The preconditions for intelligibility are the foundational realities that must be true in order for human knowledge, understanding, language, reasoning, and communication to be possible. These are often explored in philosophy (particularly epistemology, metaphysics, and logic) and are central to transcendental arguments, especially in Christian presuppositional apologetics. Understanding these preconditions is necessary for making the Transcendental Argument for God.
Below is a detailed breakdown of the major preconditions for intelligibility, what they are, and why they matter:
1. Existence of Objective Truth
What it is:
The idea that truth is real, discoverable, and not merely subjective or relative. Truth corresponds to reality.
Why it’s a precondition:
- Without objective truth, statements are neither true nor false in any ultimate sense, which collapses knowledge into opinion or preference.
- Communication becomes unintelligible if “truth” can change from person to person or moment to moment.
- The very concept of “intelligibility” assumes there is a correct interpretation or understanding of reality.
2. Laws of Logic
What they are:
Abstract, immaterial, unchanging principles of reasoning, such as:
- Law of Identity (A is A),
- Law of Non-Contradiction (A ≠ not-A),
- Law of the Excluded Middle (A or not-A).
Why they’re preconditions:
- All reasoning, language, and communication presuppose these laws.
- If contradictions can be true, then nothing can be distinguished or known.
- Argumentation becomes meaningless without these laws.
These laws are not empirical—they are presupposed in every thought, argument, and interpretation.
3. Reliability of Human Rationality
What it is:
The belief that human beings can use reason and logic to arrive at true conclusions about the world.
Why it’s a precondition:
- If the human mind evolved solely through unguided material processes, it raises questions about why it should be trusted to produce true beliefs rather than merely survival-oriented beliefs (see Alvin Plantinga’s Evolutionary Argument Against Naturalism).
- Rationality must be grounded in something more than subjective or accidental brain states.
4. Existence and Knowability of an External World
What it is:
The assumption that:
- There is a real, physical world outside of our minds,
- Our senses are basically reliable in giving us information about it.
Why it’s a precondition:
- If we cannot trust that there is a consistent, external reality, then empirical knowledge collapses.
- All science, investigation, and communication assume that we are referring to the same external world.
5. Uniformity of Nature
What it is:
The principle that the laws of nature are consistent and regular across time and space (e.g., gravity works the same today as it did yesterday).
Why it’s a precondition:
- All scientific inquiry, prediction, and induction rely on the assumption that past experiences are relevant to the future.
- Without uniformity, experience loses its informative power, and causality becomes unpredictable.
This assumption is not provable by science, since science presupposes it in order to function. This is the problem of induction (as raised by David Hume).
6. Moral Absolutes
What it is:
The belief that some moral values and duties are objectively real, such as truthfulness, fairness, and logical honesty.
Why it’s a precondition:
- If lying, deception, or manipulation are morally acceptable or equally valid to honesty, then rational discourse becomes impossible.
- Debates or discussions require shared moral norms, like fairness and intellectual integrity.
7. Meaningful Language and Communication
What it is:
The assumption that:
- Words have objective meaning,
- Communication is not arbitrary but is referential, conveying real concepts about the world.
Why it’s a precondition:
- If language is entirely subjective or socially constructed without constraint, then words can mean anything or nothing.
- Understanding requires semantic stability—a correspondence between symbols (language) and referents (reality).
8. Personal Identity and Continuity of the Self
What it is:
The idea that a person remains the same self over time, with a continuous identity capable of learning, reasoning, and referencing past experiences.
Why it’s a precondition:
- Rational deliberation requires a stable subject doing the reasoning.
- Memory, learning, and accountability all require personal continuity.
9. Value of Knowledge and Rational Inquiry
What it is:
The belief that pursuing truth and understanding is valuable, and that knowledge is preferable to ignorance.
Why it’s a precondition:
- If knowledge has no objective value, then truth-seeking has no intrinsic justification.
- Intelligibility requires that we care about being correct rather than merely asserting power, emotion, or preference.
10. The Possibility of Transcendentals
What it is:
The assumption that universal, abstract, invariant concepts exist—such as logic, morality, truth, and numbers.
Why it’s a precondition:
- These are not reducible to matter, time, or space, but they are necessary to make sense of anything.
- If only the material exists, then the grounding for immaterial concepts evaporates.
Summary Table
| Precondition | Why It’s Necessary |
|---|---|
| Objective Truth | Without it, knowledge collapses into relativism. |
| Laws of Logic | All reasoning and meaning depend on them. |
| Human Rationality | Must be reliable to draw true conclusions. |
| External World | Needed for sensory knowledge and shared reference. |
| Uniformity of Nature | Without it, prediction and science are unintelligible. |
| Moral Absolutes | Necessary for honest discourse and ethical reasoning. |
| Meaningful Language | Allows communication about real things. |
| Personal Identity | Needed for memory, responsibility, and rational thought. |
| Value of Truth | Justifies the pursuit of understanding. |
| Transcendentals (Logic, Morality, etc.) | Universals must exist to account for non-material truths. |
The Transcendental Argument Connection
A Transcendental Argument (e.g., TAG or TWA) asks:
What must be true for anything to be intelligible at all?
This leads to the argument that only certain worldviews (such as the Christian worldview) can account for these preconditions without contradiction, while others (e.g., materialism, relativism) borrow them without being able to justify them.