What does this quote mean?

“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.”

“There is nothing either good or bad, but thinking makes it so.”

The line separates events from the judgments people place on them, a useful distinction for thinking about perception and response.

Source note: Hamlet, Act 2, Scene 2; Hamlet says this to Rosencrantz and Guildenstern while explaining that Denmark feels like a prison to him. The line is dramatic dialogue, not a detached psychological proposition by Shakespeare.

“A thing of beauty is a joy for ever.”

Keats opens the poem by claiming that beauty can continue to give delight beyond the instant in which it is first encountered.

Source note: Endymion, Book I, opening line; Project Gutenberg #24280. This is a poetic proposition within a Romantic work, not an empirical rule that every aesthetic experience remains pleasurable forever.

“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.

“In Wildness is the preservation of the World.”

Wild nature is presented not as useless space but as a preserving force for imagination, freedom, and human flourishing.

Source note: Essay “Walking”; Thoreau links uncultivated nature with renewal and human vitality.

“I bequeath myself to the dirt to grow from the grass I love.”

Death becomes continuity with nature rather than simple disappearance, connecting mortality with renewal, earth, and the lives that follow.

Source note: Final section of “Song of Myself”; the speaker imagines returning physically to the earth.