Simplicity and beauty are the signs not of truth but of a well-constructed approximate model of a limited domain of phenomena.

But in spite of the obvious effectiveness of mathematics in physics, I have never heard of a good a prioriargument that the world must be organised to mathematical principles.

Having begun my life in science searching for the equation beyond time, I now believe that the deepest secret of the universe is that its essence rests in how it unfolds moment by moment in time.

The page of my notebook was filled with many messy integrals, but all of a sudden I saw emerge a formula for counting. I had begun to calculate a quantity on the assumption that the result was a real number, but found instead that, in certain units, all the possible answers would be integers. This meant that areas and volumes cannot take any value, but come in multiples of fixed units.

Surprise is inherent in the structure of the world.

Any two particles in the universe attract each other through the gravitational interaction.

One possibility is: God is nothing but the power of the universe to organize itself.