What does the author mean by the “ocean of truth” he describes?

The quote this question is asking about is:

"I always came from my studies discontented and unsatisfied. Sir Isaac Newton is said to have avowed that he felt like a child picking up shells beside the great and unexplored ocean of truth."

The answer is "There is much to learn."

I just took the test and this was the correct answer.

based on the biblical principle proverbs 16: 32, i agree with the author of the passage "better is it that it takes longer to be angry than the strong " to the extent that i share the philosophy that the nobility of heart demonstrates the strength of a person. those who are very proud, get angry easily and show their anger toward others are really weak, but those who are noble and do not constantly obfuscate or contain their feelings of anger, are strong people