真理，通过理性思考和观察自然得出。

The Hebrews have done more to civilize men than any other nation.

In the end, you’re measured not by how much you undertake but by what you finally accomplish.

The mathematician does not study pure mathematics because it is useful; he studies it because he delights in it and he delights in it because it is beautiful.

Cheerfulness is the best promoter of health.

The sea is a place of great beauty and great terror.

"The only real failure in life is not to be true to the best one knows."

经济史告诉我们，改变是可能的，但很少是容易的。