- What is the purpose of life?
- What happens after death?
- What is the nature of reality?
- What is the meaning of existence?
- What is the best way to live a meaningful life?
- What is the source of morality and ethics?
- What is the nature of consciousness and the self?
- What is the relationship between humans and the natural world?
- What is the solution to suffering and injustice?
- What is the nature of happiness and how can it be attained?