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(p.80) "The high-energy scattering experiments of the past decades have shown
us the dynamic and ever-changing nature of the particle world in the most
striking way. Matter has appeared in these experiments as completely mutable.
All particles can be transmuted into other particles; they can be created
from energy and can vanish into energy. In this world, classical
concepts like "elementary particle", "material substrance" or "isolated
object" have lost their meaning; the whole universe appears as a
dynamic web of inseparable energy patters. So far, we have not yet
found a complete theory to describe this world of subatomic particles,
but we do have several theoretical models which describe certain aspects
of it very well. None of these models is free from mathematical difficulties,
and they all contradict each other in certain ways, but all of them reflect
the basic unity and the intrinsically dynamic character of matter. They
show that the poperties of a particle can only be understood in terms of
its activity - of its interaction with the surrounding environment - and
that the particle, therefore, cannot be seen as an isolated entity, but
has to be understood as an integrated part of the whole."
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