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

"Languages are true analytical methods; algebra, which is adapted to its purpose in every species of expression, in the most simple, most exact, and best manner possible, is at the same time a language…"

"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…"

"The more I study, the more I am convinced of the existence of a superior intelligence."

"It is impossible for me to write anything without feeling myself inspired by a sort of scientific enthusiasm."