How to report "Ocean of Knowledge"
I think in my neck of the woods it'd be more idiomatic to speak of a (vast) sea of knowledge. But a (great) ocean of knowledge is okay, indeed if you google around you will see many many people using it.
Universe of Knowledge is another metaphor:
- "Universe of knowledge" is a metaphor that has been important in library classification theory.
Source: http://www.iva.dk/bh/Lifeboat_KO/CONCEPTS/universe_of_knowledge.htm