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

"The velocity of light is a quantity of which we have now a more accurate knowledge than of any other physical constant."

"The only way of discovering the extent of the laws of nature is to try to transcend them."

"But I think that the results which each man arrives at in his attempts to harmonize his science with his Christianity ought not to be regarded as having any significance except to the man himself, and…"

"Every existence above a certain rank has its singular points; the higher the rank the more of them. At these points, influences whose physical magnitude is too small to be taken account of by a finite…"