Since all chemical and molecular activity is dependent on the transmission of quanta of action from one point to another, i.e., all activity comes from photons, the quantum of action can be viewed as the fundamental unit of the universe. Photons have no rest mass and no time. We observe them moving at the speed of light, which is more significant as a boundary condition of the physical universe than as a measure of the photon. They are as nonmaterial and ephemeral as anything in the manifest universe. The quantum of action also happens to be exactly the same size as the minimum uncertainty of Heisenberg's uncertainty principle, suggesting that it is equivalent to a quantum of uncertainty.
Action is totally unpredictable.
Science can never penetrate its mysteries. They range from what is totally free and unconstrained and nonobjective to the complete constraint of the objective spacio-temporal realm. These distinctions are not arbitrary but reflect an underlying set of divisions and associated qualities in the universe. Such an interface with science, it should be stressed, was not possible until the scientific discoveries of this century, most notably quantum physics. Before 1900 science did not have an adequate conceptual vocabulary to make a fourfold distinction in physics.