"Ideas and techniques known in quantum electrodynamics have been applied to the Bardeen-Cooper-Schrieffer theory of superconductivity. In an approximation which corresponds to a generalization of the Hartree-Fock fields, one can write down an integral equation defining the self-energy of an electron in an electron gas with phonon and Coulomb interaction. The form of the equation implies the existence of a particular solution which does not follow from perturbation theory, and which leads to the energy gap equation and the quasi-particle picture analogous to Bogolyubov's."

"Has not the famous political Fable of the Snake, with two Heads and one Body, some useful Instruction contained in it? She was going to a Brook to drink, and in her Way was to pass thro' a Hedge, a Tw…"

"My dear John Russell, Till lately I had strong confidence in the fair intentions of Napoleon towards England, but of late I have begun to feel great distrust and to suspect that his formerly declared …"

"Fine thoughts and moral dissertations from men who have not worked and suffered may be read, but they will be forgotten. No religion, no Ethical philosophy is worth anything, if the teacher has not li…"

"Wholeness , Gestalt, is the primary attribute of life."