There were several possible solutions of the difficulty of classical electrodynamics, any one of which might serve as a good starting point to the solution of the difficulties of quantum electrodynamics.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

While physics and mathematics may tell us how the universe began, they are not much use in predicting human behavior because there are far too many equations to solve. I’m no better than anyone else at understanding what makes people tick, particularly women.

I went to Princeton specifically to study physics.

It was Einstein’s dream to discover the grand design of the universe, a single theory that explains everything. However, physicists in Einstein’s day hadn’t made enough progress in understanding the forces of nature for that to be a realistic goal.

Life would pall if it were all sugar; salt is bitter if taken by itself; but when tasted as part of the dish, it savours the meat. Difficulties are the salt of life.

Science is beautiful when it makes simple explanations of phenomena or connections between different observations. Examples include the double helix in biology and the fundamental equations of physics.

I can imagine it’s hard to make a relationship last. I wouldn’t know.

What goes up must come down.

The drawing teacher has this problem of communicating how to draw by osmosis and not by instruction, while the physics teacher has the problem of always teaching techniques, rather than the spirit, of how to go about solving physical problems.

Some people say that I should study to become a climate scientist so that I can ‚solve the climate crisis.‘ But the climate crisis has already been solved. We already have all the facts and solutions. All we have to do is to wake up and change.

Our future cannot depend on the government alone. The ultimate solutions lie in the attitudes and the actions of the American people.

Indians felt despondent about Indian governance. Changing that atmosphere of gloom was a very challenging task, and I faced many difficulties in rectifying the situation and bringing back confidence and hope.

Among physicists, I’m respected I hope.

Science predicts that many different kinds of universe will be spontaneously created out of nothing. It is a matter of chance which we are in.

Man can be understood only by ascending from physics, chemistry, biology, and geology. In other words, he is first of all a cosmic problem.

Atoms are very special: they like certain particular partners, certain particular directions, and so on. It is the job of physics to analyze why each one wants what it wants.

The missing link in cosmology is the nature of dark matter and dark energy.

My first popular book, ‚A Brief History of Time,‘ aroused a great deal of interest, but many found it difficult to understand.

In my school, the brightest boys did math and physics, the less bright did physics and chemistry, and the least bright did biology. I wanted to do math and physics, but my father made me do chemistry because he thought there would be no jobs for mathematicians.

All the evidence, experimental and even a little theoretical, seems to indicate that it is the energy content which is involved in gravitation, and therefore, since matter and antimatter both represent positive energies, gravitation makes no distinction.

To every action there is always opposed an equal reaction.

I think we all change each other’s paths. I don’t know which law idea that is in physics, but I don’t think any of us can live without affecting one another.

The solutions to our problems are and always will be based upon universal, timeless, self-evident principles common to every enduring, prospering society throughout history.

I think equation guessing might be the best method to proceed to obtain the laws for the part of physics which is presently unknown. Yet, when I was much younger, I tried this equation guessing, and I have seen many students try this, but it is very easy to go off in wildly incorrect and impossible directions.

I think you should always bear in mind that entropy is not on your side.

The same thing is to be understood of all bodies, revolved in any orbits. They all endeavour to recede from the centres of their orbits, and were it not for the opposition of a contrary force which restrains them to and detains them in their orbits, which I therefore call Centripetal, would fly off in right lines with a uniform motion.

Governments will always play a huge part in solving big problems. They set public policy and are uniquely able to provide the resources to make sure solutions reach everyone who needs them. They also fund basic research, which is a crucial component of the innovation that improves life for everyone.

It is hard to read a newspaper or watch a television newscast without encountering someone who has come up with a new ‚solution‘ to society’s ‚problems.‘

Those who today always look for disciplinarian solutions, those who long for an exaggerated doctrinal ‚security,‘ those who stubbornly try to recover a past that no longer exists – they have a static and inward-directed view of things. In this way, faith becomes an ideology among other ideologies.

My father was a research scientist in tropical medicine, so I always assumed I would be a scientist, too. I felt that medicine was too vague and inexact, so I chose physics.

Quarks came in a number of varieties – in fact, at first, only three were needed to explain all the hundreds of particles and the different kinds of quarks – they are called u-type, d-type, s-type.

You have a row of dominoes set up; you knock over the first one, and what will happen to the last one is that it will go over very quickly.

The first amazing fact about gravitation is that the ratio of inertial mass to gravitational mass is constant wherever we have checked it. The second amazing thing about gravitation is how weak it is.

There happen to be a lot of people around who spent an hour on the Internet and think they know a lot of physics, but it doesn’t work like that… There’s a reason there are graduate schools in these departments.

I had a project for my life which involved 10 years of wandering, then some years of medical studies and, if any time was left, the great adventure of physics.

I hope I have helped to raise the profile of science and to show that physics is not a mystery but can be understood by ordinary people.

It is indeed a matter of great difficulty to discover, and effectually to distinguish, the true motions of particular bodies from the apparent because the parts of that immovable space, in which those motions are performed, do by no means come under the observation of our senses.

Today, all physicists know from studying Einstein and Bohr that sometimes an idea which looks completely paradoxical at first, if analyzed to completion in all detail and in experimental situations, may, in fact, not be paradoxical.

Physics has a history of synthesizing many phenomena into a few theories.

It is now quite lawful for a Catholic woman to avoid pregnancy by a resort to mathematics, though she is still forbidden to resort to physics or chemistry.

Love always brings difficulties, that is true, but the good side of it is that it gives energy.

All progress is precarious, and the solution of one problem brings us face to face with another problem.

There are children playing in the streets who could solve some of my top problems in physics, because they have modes of sensory perception that I lost long ago.

What’s right about America is that although we have a mess of problems, we have great capacity – intellect and resources – to do some thing about them.

China has many successful entrepreneurs and business people. I hope that more people of insight will put their talents to work to improve the lives of poor people in China and around the world, and seek solutions for them.

Science fiction writers foresee the inevitable, and although problems and catastrophes may be inevitable, solutions are not.

I need physics more than friends.

Man needs his difficulties because they are necessary to enjoy success.

If you are in a spaceship that is traveling at the speed of light, and you turn on the headlights, does anything happen?

They say the universe is expanding. That should help with the traffic.

My discovery that black holes emit radiation raised serious problems of consistency with the rest of physics. I have now resolved these problems, but the answer turned out to be not what I expected.

Philosophers have not kept up with modern developments in science. Particularly physics.

Because atomic behavior is so unlike ordinary experience, it is very difficult to get used to, and it appears peculiar and mysterious to everyone – both to the novice and to the experienced physicist.

There are no black holes in the sense of regimes from which light can’t escape to infinity.

The same law takes place in a system, consisting of many bodies, as in one single body, with regard to their persevering in their state of motion or of rest. For the progressive motion, whether of one single body or of a whole system of bodies, is always to be estimated from the motion of the center of gravity.

Gravitation is, so far, not understandable in terms of other phenomena.

We are the product of quantum fluctuations in the very early universe.

No one undertakes research in physics with the intention of winning a prize. It is the joy of discovering something no one knew before.

When I was a young man, Dirac was my hero. He made a breakthrough, a new method of doing physics. He had the courage to simply guess at the form of an equation, the equation we now call the Dirac equation, and to try to interpret it afterwards.

I think the discovery of supersymmetric partners for the known particles would revolutionize our understanding of the universe.