When he went in, he saw different kinds of books. Normal books, Flying books, Floating untouchable books, Books with chains, Part of books, Scrolls, Scrolls made of gold and silver, Books with strange color floating around, etc.
Reacting to this, he wanted to read everything. He thought,
"I really want to read these things, i wonder if this was created by those 3 beings."
but as he did not had a physical body to go to the universe with, he had to wait for other people to read and continue with them while they read. This process he called it painful, as this was how he was reading the books and scrolls, the entire process took another 70 years, but surprisingly he was not bored.
After attaining his newborn knowledge, he wanted to explore the universe again. He saw many things but this time he knew what he saw, black holes, spiral galaxies, cluster galaxies, white dwarves, black dwarves, supernovas, ultranovas and many other wonderful things.
One time he came across a civilization. He looked at the planet they were in. It was a wonderful planet with different kinds of life and nature places.
As the intelligent race of this planet were having troubles advancing, he helped with his creation and destruction. One of the 9 Supreme Gods saw this but didn't care too much. After helping them he went on and explored even more.