When a blind beetle crawls over the surface of a globe he doesn't notice that the track he has covered is curved. I was lucky enough to have spotted it.

Since that deluge of newspaper articles I have been so flooded with questions, invitations, suggestions, that I keep dreaming I am roasting in Hell, and the mailman is the devil eternally yelling at me, showering me with more bundles of letters at my head because I have not answered the old ones.

On the left-hand side of the field equation we may add the fundamental tensor guv, multiplied by a universal constant, -λ, at present unknown, without destroying the general covariance.

Bureaucracy is the death of all sound work.

Truth is what stands the test of experience.

I must seem like an ostrich who forever burries its head in the relativistic sands in order not to face the evil quanta.

To be free means to be independent, not to be influenced by what others think and say.