"...the modern concepts of chemical bonding must account,
on one hand at least, for the systematics found empirically in previous decades and centuries by inductive and typically chemical approaches, which are still being extended by further chemical laboratory research.
On the other hand, and of course primarily, one has to apply the deductive reductionistic approaches made possible by the modern physical theory of relativistic quantized fields and the respective approximations to it, and one should also try to create new schemes of ordering the manifold of chemical facts along lines which can be assessed by this basic theory."