A hundred thousand million Stars make one Galaxy; A hundred thousand million Galaxies make one Universe. The figures may not be very trustworthy, but I think they give a correct impression.

Man is slightly nearer to the atom than to the star. ... From his central position man can survey the grandest works of Nature with the astronomer, or the minutest works with the physicist. ... [K]nowledge of the stars leads through the atom; and important knowledge of the atom has been reached through the stars.

The word reality frightens me.

It is also a good rule not to put overmuch confidence in the observational results that are put forward until they are confirmed by theory.

I ask you to look both ways. For the road to a knowledge of the stars leads through the atom; and important knowledge of the atom has been reached through the stars.

Human life is proverbially uncertain; few things are more certain than the solvency of a life-insurance company.

Schrödinger's wave-mechanics is not a physical theory, but a dodge - and a very good dodge too.