The true investor scarcely ever is forced to sell his shares, and at all other times he is free to disregard the current price quotation.
数学家是能在定理间找到类比的人；更好的数学家能在理论间看到类比；而最优秀的数学家能注意到类比之间的类比。
Hold to the now, the here, through which all future plunges to the past.
【原文】子夏为莒父宰，问政。子曰：“无欲速，无见小利。欲速则不达，见小利则大事不成。”【译文】子夏到莒父做地方长官，问怎样为政。孔子说：“不要只求速成，不要贪图小利。想求速成，反而达不到目的；贪图小利，就做不成大事。”
It is not the computer's fault that Maxwell's equations are not adequate to design the electric motor.