The celebrated mathematician, Edmund Stone, would never have published a mathematical dictionary, never have found the key to science of mathematics, if he had given his spare moments to idleness.

如果著名的数学家埃德蒙·斯通 (Edmund Stone) 将业余时间用于无所事事，他将永远不会出版一本数学词典，也永远不会找到数学科学的钥匙。