"The mathematical difficulties of the subject are so enormous that it is only by great patience and perseverance that we can hope to overcome them."

"I have no doubt that there are many persons who would be very glad to get rid of the ether."

"In the very beginning of science, the parsons, who managed things then, Being handy with hammer and chisel, made gods in the likeness o' men; Till Commerce arose and at length some men of exceptional …"

"The human mind is seldom satisfied, and is certainly never exercising its highest functions, when it is doing the work of a calculating machine."

"The true logic of this world is in the calculus of probabilities."