For example, an experience in your life that "helping others is helping yourself".

The first time I came to Guangzhou alone, a middle-aged woman borrowed my mobile phone on the train, so I lent it to her. Later, their families kept in touch with me and invited me to their home, which made me feel a little warm in Guangzhou. A short day trip on the train, an unintentional move, became friends. Helping others is helping yourself. There are indeed many liars, but good people always make up the majority.