Regarding metaphysical inquiries, most of the time we can’t reach the truth. But sometimes we can take steps toward concluding what cannot be the case. The so-called apophatic knowledge.
You can draw conclusions of negative knowledge, e.g. that the universe is not created by an elephant or the number 43, either through reasoning or simple intuition. But on the other hand, it is not easy to draw conclusions of positive knowledge about the root of existence from
- “nothing”
- “god”
- “first unmoved mover” etc.
Negative/apophatic knowledge investigations need to be handled carefully too, because the most fundamental truths seem to resolve into paradoxes and antinomies with our current tools and understanding.