A truly rational theory would allow us to deduce the elementary particles (electron, etc.) and not be forced to state them a priori.

— Albert Einstein, Letter to Michele Besso (1952)

Source: http://books.google.com/books?id=FFIBzawsfPEC&lpg=PR1&pg=PA154#v=onepage&q&f=false

Letter of 10 September 1952, collected in Correspondance 1903-1955.

Topics: science