"The imagination is a dangerous guide in science, but it can be a useful servant."

"The most important thing for a man of science is to have a clear head and a good heart."

"It is not often that a man has the opportunity to be useful to his fellow citizens without any personal risk."

"The greatest obstacle to discovery is not ignorance, but the illusion of knowledge."

"It is almost possible to predict one or two days in advance, within a rather broad range of probability, what the weather is going to be; it is even thought that it will not be impossible to publish d…"