"神秘重力无人解，天才牛顿亦书空" 注

引用：

语本南朝宋刘义庆《世说新语、黜免》：“殷中军被废，在信安，终日恒书空作字。扬州吏民寻义逐之，窃视，唯作‘咄咄怪事’四字而已。”后因以“书空咄咄”为叹息、愤慨、惊诧的的典实。

"I have not yet been able to discover the cause of these properties of gravity from phenomena and I feign no hypotheses... "- Issac Newton, 1713.