What does this quote mean?

“The universe is wider than our views of it.”

Reality exceeds any one viewpoint, so confidence in a perspective should leave room for what has not yet been seen.

Source note: Walden, Conclusion; Thoreau uses the sentence while arguing that familiar human views do not exhaust reality.

“He who knows only his own side of the case, knows little of that.”

Understanding a position requires serious contact with competing arguments; familiarity with only one side can produce confidence without real comprehension.

Source note: On Liberty, Chapter 2; Mill argues for open discussion because opposing views expose weaknesses and sharpen understanding.

“Seldom, very seldom, does complete truth belong to any human disclosure.”

Austen observes that even sincere accounts can contain omission, disguise, or misunderstanding, which makes careful listening and humility important in judging what people say.

Source note: Emma, Volume III, Chapter 13, during the narrator’s reflection on Emma and Mr. Knightley’s conversation.

“To define is to limit.”

Definitions clarify ideas but can also narrow them, especially when a label is treated as the complete reality of a person or experience.

Source note: The Picture of Dorian Gray, 1891 edition, Chapter 17; Lord Henry answers the Duchess of Monmouth’s question “What are you?” with “To define is to limit.”

“All that glisters is not gold.”

Appearance can imitate value without possessing it, so the line encourages evidence and discernment before admiration or trust.

Source note: Act 2, Scene 7; the inscription warns against judging by outward appearance.

“To err is human; to forgive, divine.”

Error is treated as ordinary human limitation, while forgiveness requires an additional act of generosity.

Source note: An Essay on Criticism, Part II; Pope warns that shallow learning can produce premature confidence before deeper study tempers judgment.