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To me, what makes physics physics is that experiment is intimately connected to theory. It's one whole.

Everything starts somewhere, although many physicists disagree.

Today's preoccupation with physical theories of everything takes a wrong turn from the purpose of science - to question all things relentlessly. Modern physics has become like Swift's kingdom of Laputa, flying absurdly on an island above the earth and indifferent to what is beneath.

When one studies the properties of atoms, one found that the reality is far stranger than anybody would have invented in the form of fiction. Particles really do have the possibility of, in some sense, being in more than one place at one time.

Physics is based on the assumption that certain fundamental features of nature are constant.

Now, what space ultimately is - I should confess, I think most physicists believe - we don't yet know.

One of the principal achievements of physics in the 20th century has been the revelation that the atom is not indivisible or elementary at all but has a complex structure.

In physics, all can you do is predict the consequences of physical laws.

In 1956, when I began doing theoretical physics, the study of elementary particles was like a patchwork quilt. Electrodynamics, weak interactions, and strong interactions were clearly separate disciplines, separately taught and separately studied. There was no coherent theory that described them all.

What we observe as material bodies and forces are nothing but shapes and variations in the structure of space.