Water has a pure taste and an indifferent nature. With such moral conduct, you can be my teacher.

This is not about making friends, but expresses the author’s view of using bamboo as a friend and water as a teacher, to warn people to be upright and modest, and to be pure and indifferent in dealing with things.

The second sentence is from "Zhuangzi and Huizi Traveled in Haoliang"

Original sentence:

Zhuangzi said: "The minnow travels calmly, which is the best of fishes." "Huizi said: "You are not a fish, how can you know the joy of fish?" Zhuangzi said: "You are not me, how can you know that I don't know the joy of fish?

Zhuangzi changed the concept and showed Superb sophistry