Every problem has a decisive point
A reason may take the principal role because, if it failed, the very object of the discussion would change.
Grammar of validity
Truth-Validity Levels and Grounds of Validity
Why different kinds of reasons cannot be confused, mechanically added, or substituted for one another
Definition
What is a ground of validity?
It is the specific reason on the basis of which a claim asks to be accepted. To say that a thesis is well-grounded, well-justified, coherent, or publicly defensible is not to repeat the same praise in different words; it is to make different judgments.
The problem arises when one of these reasons is treated as equivalent to all the others. An impeccable demonstration may begin from a badly framed premise; an accurate description may be used to legitimize what it merely describes.
Distinguishing these grounds does not fragment truth. It prevents unity from being achieved by erasing decisive differences.
Rules
How they operate without becoming a ranking
The other reasons do not disappear
What is not central may still impose a limit, signal an incompatibility, or prevent an overbroad conclusion.
Not every deficiency carries the same weight
Some defects require supplementation; others make the claim unacceptable because they destroy one of its indispensable conditions.
Conflict
When reasons come into tension
A tension should not be hidden behind a formula of compromise. It may indicate that the thesis has been badly constructed, that it uses the same word for different functions, or that an unexpected consequence requires its scope to be redefined.
Conflict becomes productive when it makes it possible to locate the error. The question is not generically “is it true or false?” but: which reason holds, which is missing, and what conclusion is licensed by what actually holds?
This analysis makes it possible to preserve a partial result without turning it into an absolute.
Example
Can a theory be coherent and nevertheless false?
Yes. Coherence shows that propositions do not contradict one another within a given framework; it does not guarantee that the premises correctly grasp their object. Even an imaginary system can be perfectly ordered.
The converse is also true: correct reference to reality is not enough if the argument that articulates it is contradictory or unable to justify the passage to its conclusions. Each ground therefore retains a non-interchangeable task.
Use
The useful question is not “how many tests does it pass?”
Counting favorable aspects would produce a quantitative image of truth. The test is structural instead: one must determine which conditions are necessary for that particular claim and what function each performs.
A single contradiction may be decisive; many peripheral confirmations may fail to compensate for it. The evaluation depends on where the defect lies, not on the number of elements collected.