The only meaningful way to study learning is through objective measurement.
研究学习的唯一有意义的方法是通过客观测量。
The desire for recognition is the most fundamental human desire, and it is the source of both the greatest achievements and the greatest tragedies in human history.
The human capacity for care is not finite; the more we give, the more we have to give.
The real tragedy of the poor is that they can afford nothing but self-denial.
骄矜自大，独断专行，招祸之源。
我从不买任何东西，除非我能给自己一个充分的理由为什么要买它。