"For the development of science all such short-mind symbols are... paramount... and seem to carry within themselves the germ of a perpetual mental motion... for its unfoldment. Euler's well-known saying that his pencil seemed to surpass him in intelligence finds its explanation here, and will be understood by all who have experienced the uncanny feeling attending the rapid development of algebraical formulae, where the urned thought of centuries... rolls from one's finger's ends."