The myth of causality denies the role of Eris, the Greek goddess of discord and strife . Reason is a powerful tool, but it cannot get us to Truth without some illumination. The rational process requires some insight to make sense of itself. Immanuel Kant said that we superimpose our ideas of order on the world. He also said that what gives an act moral value is that it is performed for its own sake, and not for some Telos, or goal, that we have in mind.
Mystery seems to be more spiritual, where chaos is more neutral.
Things that we had not previously found order in, through science, we have been able to explain. A theory is designed to explain something. Heidegger says that science looks at those things that it can understand and doesn't take into account the things that it cannot explain. They seem to advocate breaking down the superimposed order to allow for the natural order. It is also possibly implied that order and disorder coexist together, and one or the other will be taken as primary.