"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
"The world is full of signs and wonders, but we walk past them every day without seeing."
A problem well put is half solved.
He said that the way of the world is to bloom and to flower and die but in the affairs of men there is no waning and the noon of his expression signals the onset of night. His spirit is exhausted at the peak of its achievement. His meridian is at once his darkening and the evening of his day.
相关系数的可能误差不是可以从第一原理推导出来的东西，而是必须通过经验找到的。