"The philosopher should be a man willing to listen to every suggestion, but determined to judge for himself."

"Magnetic curves are lines of force; they are not only lines of force but lines of action."

"Nothing is too wonderful to be true if it be consistent with the laws of nature."

"The important thing is to know how to take a hint, to seize upon the suggestion, however small, and to extract its full value."

"I can at any moment convert my time into money, but I do not require more of the latter than is sufficient for necessary purposes."