在没有其他信息的情况下，参数的最佳估计是其样本值。

Words and deeds are not separate， but intimately connected.

"The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart."

The hardest thing to explain is the glaringly evident which everybody had decided not to see.

No man, for any considerable period, can wear one face to himself and another to the multitude, without finally getting bewildered as to which may be the true.

应对一个不自由的世界，唯一的方法就是变得如此绝对自由，以至于你的存在本身就是一种反抗。