Our knowledge of the real is inevitably the result of a belief-mediated grasp — or mis-grasp — of facts. Belief affords our only access to the knowledge of nature: our theories are the only feasible pathways to nature's laws. Kant was right: the "I think" is omnipresent in the cognitive domain — though in scientific contexts it generally comes into operation in the objectifying plural "we think". And this brings the characteristic mechanisms of mental operation upon the stage.