Every theory, every human idea, has its limitations.
No intellect can explain what is illogical. But even within the realm of logic, every idea is limited to its particular subject matter. And within that subject matter itself, there will always be false conclusions and/or some kind of incompleteness.
Each thought of Torah, on the other hand, is complete in itself and infinite in all its applications. A thought of Torah is as infinite as the One who gave it.