I am disturbed by the following questions due to my imperfect knowledge of Sanatana Dharma.

1. What is the purpose of this existence?
2. Why is the existence so painful?
3. Is Moksh the highest purpose for a human being?
4. Advaita in sanskrit means "NOT TWO", SO ...Is God and Advaita one and the same thing and He is the
source of this existence without purpose?

Will someone kindly oblige me by giving answers to above questions . I shall be very thankful.