But doesn't it come out here that knowledge is related to a decision?

At the core of all well-founded belief lies belief that is unfounded.

Superstition is the belief in the causal nexus.

Belief in the causal nexus is superstition.

All testing, all confirmation and disconfirmation of a hypothesis takes place already within a system. And this system is not a more or less arbitrary and doubtful point of departure for all our arguments: no, it belongs to the essence of what we call an argument. The system is not so much as the point of departure, as the element in which arguments have their life.