It is the irrational that which reasoning cannot exhaust, that which concepts are unable to grasp without leaving something still unexplained. For the science of human action, the valuations and goals of the final order at which men aim constitute the ultimate given, which it is unable to explain any further. All that it attempts to do is to see and determine what the values in a given case are, and nothing more. Where the historian tries to go beyond this, he becomes an apologist or a judge, an agitator or a politician. He leaves the sphere of reflective, inquiring, theoretical science and himself enters the arena of human action.
Science belongs completely to the domain of rationality.
There can no more be a science of the irrational than there can be irrational science. The irrational lies outside the domain of human reasoning and science. When confronted with the irrational, reasoning and science can only record and classify. Indeed, the criterion of the irrational is precisely that it cannot be fully comprehended by reasoning. That which we are able to master completely by reasoning is no longer irrational.