A consistent pursuit of classical physics forces a transformation in the very heart of that physics.

The very act of observing disturbs the system.

The basic idea is to shove all fundamental difficulties onto the neutron and to do quantum mechanics in the nucleus.

Every tool carries with it the spirit by which it has been created.

The incomplete knowledge of a system must be an essential part of every formulation in quantum theory. Quantum theoretical laws must be of a statistical kind. To give an example: we know that the radium atom emits alpha-radiation. Quantum theory can give us an indication of the probability that the alpha-particle will leave the nucleus in unit time, but it cannot predict at what precise point in time the emission will occur, for this is uncertain in principle.

If nature leads us to mathematical forms of great simplicity and beauty - by forms I am referring to coherent systems of hypothesis, axioms, etc. - to forms that no one has previously encountered, we cannot help thinking that they are "true," that they reveal a genuine feature of nature... You must have felt this too: The almost frightening simplicity and wholeness of relationships which nature suddenly spreads out before us and for which none of us was in the least prepared.

Even for the physicist the description in plain language will be a criterion of the degree of understanding that has been reached.