学习理论中的一个关键见解是，假设类的复杂性对于泛化至关重要。
I'm not afraid to take a stand. Everybody come take my hand. We'll walk this road together, through the storm. Whatever weather, cold or warm.
史记
The only thing more painful than being an active forgetter is to be an inert rememberer.
心是脆弱的东西，容易破碎，但也有巨大的爱和韧性。
Life is ours to be spent, not to be saved.
We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.
知足是天然的财富，奢侈是人为的贫困。