The most exhausting thing in life is being insincere, which is so common in nowadays socialty. I wonder if human beings are primarily altruistic or selfish.

• （生活中最使人筋疲力尽的事是弄虚作假，然而这在当今的社会却是比比皆是。让我开始怀疑人性究竟是本善还是自私?）