Nothing occurs for which it would be impossible for someone with enough knowledge to give a reason adequate to determine why the thing is as it is and not otherwise.

Leibniz believed that every phenomenon could be explained. His Principle of Sufficient Reason states that “nothing takes place without a sufficient reason; in other words,…nothing occurs for which it would be impossible for someone who has enough knowledge of things to give a reason adequate to determine why the thing is as it is and not otherwise.” Though not everything possible happens (and, therefore not everything that happens is necessary), everything that happens has a sufficient reason in