In The Brain Book, Peter Russell writes: "The more that is learned about the human brain, the more its capacities and potentials are found to go far beyond earlier speculations."
Peter Russell o kwala jaana mo bukeng ya The Brain Book: "Fa go ntse go ithutiwa go le gontsi ka boboko jwa motho, seno se dira gore go lemogiwe thata gore bo na le bokgoni jo bo fetang jo pele go neng go akanyediwa gore bo na le jone."