The motion of the stars over our heads is as much an illusion as that of the cows, trees and churches that flash past the windows of our train.

We have already considered with disfavour the possibility of the universe having been planned by a biologist or an engineer; from the intrinsic evidence of his creation, the Great Architect of the Universe now begins to appear as a pure mathematician.

We may as well cut out group theory. That is a subject that will never be of any use in physics.

Put three grains of sand inside a vast cathedral, and the cathedral will be more closely packed with sand than space is with stars.

The plain fact is that there are no conclusions. If we must state a conclusion, it would be that many of the former conclusions of the nineteenth-century science on philosophical questions are once again in the melting-pot.

...to many it is not knowledge but the quest for knowledge that gives greater interest to thought-to travel hopefully is better than to arrive.

All discussion of the ultimate nature of things must necessarily be barren unless we have some extraneous standards against which to compare them.