Preaching and receiving
Preaching and learning, Chinese idiom, Pinyin is Chu á nd à OSH à uy è, which means to teach the truth and study. It comes from Han Yu's Shi Shuo in Tang Dynasty.
The idiom comes from Han Yu's Shi Shuo in Tang Dynasty: "a teacher is a teacher, so it's also a way to preach, to be educated and to dispel doubts."
Preaching and receiving
an important statement need not be prolix - yào yán bù fán