To be alive is to be mortal. To be alive is to be, from moment to moment, a survivor.

Economics is ultimately about improving human welfare.

The poor have no choice but to be honest. The rich can afford to be dishonest.

Take away love and our earth is a tomb.

To understand a sentence means to understand a language.

在科学领域，每一个被回答的问题都会引出十几个等待探索的新问题。

"The essence of literature is to capture the fleeting moments of human existence and give them permanence through words."

The most common form of despair is not being who you are.

The ability to associate depends, in turn, on the degree to which communities share norms and values and are able to subordinate individual interests to those of larger groups.