1. If we want to make friends, we must do something for others first, which requires time, physical strength, consideration and dedication. Carnegie;

What is more precious and happier than honor, wine, love and wisdom is my friendship. Hesse;

Friendship can only be produced and maintained in practice. Goethe;

The road to success must be full of broken friendship. Wells;

Friendship is based on business, and the business of the resort is also based on friendship. Rockefeller.

This is modern.

In ancient times, there were many things, such as keeping promises and doing what you want.

To keep friendship, you should keep your word.