 Wolff believes that the fact that PSR obtains becomes apparent when we consider three specific aspects of our rational/conscious experience. The first is that PSR is never contradicted by experience; the second is that we can recognize singular instances, or examples, of it in our experience of the world, and the third is that we have an inquisitive attitude toward our surroundings and future life (Ont. §§72–4). For Wolff, these characteristics are not regarded as empirical evidence for PSR, but rather that PSR is a necessary presupposition for these characteristics to be a part of our conscious experience. Thus by simply reflecting on the nature of our understanding of the world, Wolff believes that we arrive at the manifest truth of PSR.