The door to the truth is closed. The reason is that there actually are two doors to the truth: one that is ambiguous and one that is doubly contradictory (ie, contradictory both in time and over time. These two doors furthermore appear to be the two sides of the door to the truth, meaning that the door to the truth actually is the truth. The door to the truth is thus closed because it actually is the truth.
It means that truth-searching activities, like cladistics and particle physics, are endless. Never will they find what they seek, because the door to it is it. It is impossible to see seeing itself.