Although there have been suggestions that spacetime may have a discrete structure, I see no reason to abandon the continuum theories that have been so successful.

If gravity had been sometimes attractive and sometimes repulsive, like electrodynamics, we would never notice it at all because it is about 10⁴⁰ times weaker. It is only because gravity always has the same sign that the gravitational force between the particles of two macroscopic bodies like ourselves and the Earth add up to give a force we can feel.

If you calculated something roughly, it would give a reasonable answer. But if you tried to compute it more accurately, you would find that the correction you thought was going to be small … was in fact very large―in fact, it was infinity!

So when some fool physicist gives a lecture at UCLA in 1983 and says, “This is the way it works, and look at how wonderfully similar the theories are,” it’s not because Nature is really similar; it’s because the physicists have only been able to think of the same damn thing, over and over again.

The theory of gravitation … stands isolated from the other theories. Gravitation is, so far, not understandable in terms of other phenomena.

Physics must be simple.

It is clearly the first of the physical sciences because the whole of physics makes use of it; it is the science of the foundations of physics.

Sometimes ignorance is a good thing.

…continuum …should be banned from the theory as a supplementary construction not justified by the essence of the problem, which corresponds to nothing “real”.