For the truth of the conclusions of physical science, observation is the supreme Court of Appeal.

The word reality frightens me.

Science is one thing, wisdom is another. Science is an edged tool, with which men play like children, and cut their own fingers. If you look at the results which science has brought in its train, you will find them to consist almost wholly in elements of mischief. See how much belongs to the word "Explosion" alone, of which the ancients knew nothing.

An electron is no more (and no less) hypothetical than a star. Nowadays we count electrons one by one in a Geiger counter, as we count the stars one by one on a photographic plate.

We have found that where science has progressed the farthest, the mind has but regained from nature that which the mind put into nature.

What is possible in the Cavendish Laboratory may not be too difficult in the sun.

Who will observe the observers?