 Although the principle of sufficient reason might seem to be self-evident, it does yield surprising results. For example, we can appeal to this principle to argue that there can be no two individuals exactly alike, because there would otherwise be no sufficient reason why one of the individuals was in one place, while the other individual was in another. The principle also supports the argument that the physical world was not created at any point in time, since there is no sufficient reason why it would be created at one point in time rather than another, since all points in time are qualitatively the same. Moreover, if the principle of sufficient reason’s scope of applicability is assumed to be limitless, then there is a definite answer to the question, “Why is there something, rather than nothing?” Schopenhauer was keen to question the universal extension of the principle of sufficient reason, mainly owing to his advocacy of Kant’s view that human rationality lacks the power to answer metaphysical questions, since our knowledge is limited by our specific and narrowly-circumscribed capacities for organizing our field of sensation.