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.

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

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.

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.

Among physicists, I’m respected I hope.

Life affords no higher pleasure than that of surmounting difficulties, passing from one step of success to another, forming new wishes and seeing them gratified.

Sometimes it seems as if there are more solutions than problems. On closer scrutiny, it turns out that many of today’s problems are a result of yesterday’s solutions.

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.

My background educationally is physics and economics, and I grew up in sort of an engineering environment – my father is an electromechanical engineer. And so there were lots of engineery things around me.

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.

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.

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.

To every action there is always opposed an equal reaction.

The music we do is for people to enjoy, dance and sing to it. Dreamers – keep on dreaming and keep working hard to achieve your goals. There are many difficulties, but what matters is to stay focused and have perseverance.

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

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

I went to Princeton specifically to study physics.

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

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.

From the point of view of basic physics, the most interesting phenomena are, of course, in the new places, the places where the rules do not work – not the places where they do work! That is the way in which we discover new rules.

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.

The observer, when he seems to himself to be observing a stone, is really, if physics is to be believed, observing the effects of the stone upon himself.

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.

Time can behave like another direction in space under extreme conditions.

If a projectile were deprived of the force of gravity, it would not be deflected toward the earth but would go off in a straight line into the heavens and do so with uniform motion, provided that the resistance of the air were removed.

In some sort of crude sense, which no vulgarity, no humor, no overstatement can quite extinguish, the physicists have known sin; and this is a knowledge which they cannot lose.

Everything starts somewhere, although many physicists disagree.

The greatest progress is in the sciences that study the simplest systems. So take, say, physics – greatest progress there. But one of the reasons is that the physicists have an advantage that no other branch of sciences has. If something gets too complicated, they hand it to someone else.

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

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.

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.

It is theoretically possible to warp spacetime itself, so you’re not actually moving faster than the speed of light, but it’s actually space that’s moving.

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.

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.

It is reasonable that forces directed toward bodies depend on the nature and the quantity of matter of such bodies, as happens in the case of magnetic bodies.

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.

Solutions are not the answer.

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

It now appears that the way the universe began can indeed be determined, using imaginary time.

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.

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

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

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

Don’t find fault, find a remedy.

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

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

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

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

We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.

Difficulties are things that show a person what they are.

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

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

Because there is a law such as gravity, the universe can and will create itself from nothing.

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

Working out another system to replace Newton’s laws took a long time because phenomena at the atomic level were quite strange. One had to lose one’s common sense in order to perceive what was happening at the atomic level.

There could be no fairer destiny for any physical theory than that it should point the way to a more comprehensive theory in which it lives on as a limiting case.

Just as the system of the sun, planets and comets is put in motion by the forces of gravity, and its parts persist in their motions, so the smaller systems of bodies also seem to be set in motion by other forces and their particles to be variously moved in relation to each other and, especially, by the electric force.

I tend to approach things from a physics framework. And physics teaches you to reason from first principles rather than by analogy.

I need physics more than friends.

Resistance is usually ascribed to bodies at rest, and impulse to those in motion, but motion and rest, as commonly conceived, are only relatively distinguished; nor are those bodies always truly at rest, which commonly are taken to be so.

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.