What is prime reality?
What is the nature of external reality, that is, the world around us?
What is a human being?
What happens to a person at death?
How do we know what is right and wrong?
What is the meaning/purpose of life?
Source: The Big Buddha statue, Lantau Island, Hong Kong. Photography. Britannica ImageQuest, Encyclopædia Britannica, 25 May 2016.