Something unknown is doing we don't know what-that is what our theory amounts to.

Electrical force is defined as something which causes motion of electrical charge; an electrical charge is something which exerts electric force.

The mathematics is not there till we put it there.

It is reasonable to hope that in the not too distant future we shall be competent to understand so simple a thing as a star.

There was a time when we wanted to be told what an electron is. The question was never answered. No familiar conceptions can be woven around the electron; it belongs to the waiting list.

Whether in the intellectual pursuits of science or in the mystical pursuits of the spirit, the light beckons ahead, and the purpose surging in our nature responds.

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.