“Ānanda! the Doctrine and Discipline I have set forth and laid down for you all shall be your Teacher after I am gone.” 400 years after the Buddha passed away, his teachings get into the writing format for the first time.

There are more than 20,000 discourses of the Buddha appear in the Buddhist text. However, exploring these 4 short-discourses allows us to understand the whole concept of the teachings of the Buddha. What are those 4?