The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little.

我从未怀疑过自己。

我能给的最好建议是保持谦逊并努力工作。

我不让错误让我灰心，我让它们教育我。

The pursuit of knowledge is a journey without end, and that's what makes it exciting.

我不和别人竞争。我和自己竞争。