The strength of a political system lies in its ability to adapt to changing circumstances and to incorporate new ideas and practices.

The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.

人很容易被自己的利益驱使，仅仅让他看到正确是不够的，还必须让他感受到它。

Only by continuous learning can we make continuous progress.

我们的矿工是美国最勤劳的人。