It is unlikely however that this enigma can be resolved at the philosophical
level. It is clear that unification of all forces including Gravity is not possible
unless we have additional clues about Physics at that unknown and unexplorable
energy scale called the Planck scale. Similarly, the key principle of the unification
of nuclear forces can not be decided unless higher energy experiments such as
those being planned now are carried out. In conclusion, what may be called the
metaphysics underlying the state of the art has been presented here. It will
continue to remain a guiding paradigm for theoretical Physics for some more
time to come.