There is no adequate defense, except stupidity, against the impact of a new idea.

To find the length of an object, we have to perform certain physical operations. The concept of length is therefore fixed when the operations by which length is measured are fixed that is, the concept of length involves as much as and nothing more than the set of operations by which length is determined.

... the scientist would maintain that knowledge in of itself is wholly good, and that there should be and are methods of dealing with misuses of knowledge by the ruffian or the bully other than by suppressing the knowledge.

In general, we mean by any concept nothing more than a set of operations; the concept is synonymous with the corresponding set of operations.

Nature does not count nor do integers occur in nature. Man made them all, integers and all the rest, Kronecker to the contrary notwithstanding.

Science is what scientists do, and there are as many scientific methods as there are individual scientists.

There is no adequate defense, except stupidity, against the impact of a new idea.