Martinus J. G. Veltman

“The reader may ask why in this book string theory and supersymmetry have not been discussed. ... The fact is that this book is about physics and this implies that the theoretical ideas discussed must be supported by experimental facts. Neither supersymmetry and string theory satisfy this criterion. They are figments of the theoretical mind.”

“Great physics does not automatically imply complicated mathematics!”

“We understand many things about particles and their interactions, but this and other mysteries make it very clear that we are nowhere close to a full understanding.”