For example, there is no one who conceived the basic laws of logic, yet everyone has to follow these laws regardless. First, its basis has to have a logic. Next, it has to have a temporal and spatial configuration. This is the a priori for physics, and it is on this that the field of physics is constructed. The knowledge of the natural sciences is not the sole truth.
Judgments are a key problem in the study of logic.
For any judgment to take place, there has to be the whole in which the subject and the predicate are contained. That is why some people understand the German word urteilen to mean 'to distinguish'. To know white and black we need to know a third party that maintains the relationship of white and black. At the ground of knowledge there has to be a synthetical whole. The synthetical whole cannot be grasped as knowledge, but it is at work at the ground of knowledge.