Question: Great Saints are said to have lot of powers which come for their meditation. Like god Sai Baba removing out the intestines and cleaning them, and Sri Madvirat Pothuluri Veerabrahmendra Swamy telling the future etc.

My question is, do they know **everything**? I mean, physics, chemistry, maths, computer science, future, astrospace etc? Can they answer 'any' question related to those?

Scientists are conducting lot of researches, sending spacecrafts into other planets spending lot of money. I think that the great saints have answers for all those that the scientists are intended to find out.

Answer: 
They do not know 'everything'. Swami Vivekananda said that a realized soul knows the essence of Reality; it does not mean that he knows every particular aspect of It's infinite manifestations. To know clay does not mean that you know every form of clay. To know Brahman is to know everything as One without a second - without manifestation. To be conscious of the One, you cannot be aware of the many, and vice versa. He said that if you are seeing the rope as a snake, you only see the snake and not the rope. When you see the rope, you no longer see the snake. You cannot see both at the same time. Likewise if you see Brahman, you no longer see the world of maya; and vice versa. 

He also said that for a man who practices continence and meditation, it is very easy to concentrate on a subject and learn it very quickly.

A knower of Brahman looks on knowledge of this world as an intelligent man of this world looks on the play of small children. He knows it is all foolishness and just play of no consequence. Or he looks on it as a man may look on the struggles of some ants; it is nothing compared to the knowledge of Brahman.
Great saints can know everything if they want to. The potential is there. When the word '*Sarvagyaata*' or Omniscient is used, it indicates a potency to know everything. Although, they choose not to intervene too much in the mundane aspects, unless required.

> 
> "The avatar role-plays with deliberate and voluntary self-limitation.
>  The avatar has infinite knowledge which he can choose to access,
>  though ordinarily he does not, or else does so selectively"
> 
> 
> 

--Excerpt from the book 'Being Different'