Johannes Stark

If the experimental physicist has already done a great deal of work in this field, nevertheless the theoretical physicist has still hardly begun to evaluate the experimental material which may lead him to conclusions about the structure of the atom.

I do not think it possible for anyone to get by in life without prejudice. However, the attempt to do so leads many people to suppose that, in order to decide any moral question, they have to find an indubitable first principle from which they can deduce an answer.