"The lesson drawn here from history is that the fundamental laws of
physics point not to some randomly chosen mathematical structure, but to an
exceptionally special one, requiring a deep understanding of the mathematical
world in order to fully appreciate it."
There is only a unique system of unities in which there is no contradiction between quatum mechanics & General Relativity. Bohr principle of correspondance play an importnat role to built this system. Also the image what is entropy in a multiple systems and its correspondant significance for one system is also the key of unification.
Towards a Grand Unified Theory of Mathematics and Physics by Peter Woit