Do we understand the nature of the universe?

We have at least two theories of physics that try to explain the nature of the universe. One is Newtonian Physics which explains (for example) how the planets track across the sky and the other is Quantum Mechanics which deals with the existence of miniature particles. These miniature particles are entities like Electrons, Quarks and Bosons (like the Higgs Boson). One would like to hear of a theory that is not so bit-wise, if we may say so.