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“To define is to limit.”
Voice: Fictional character · Lord Henry Wotton
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.”
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“All men by nature desire to know.”
Aristotle treats the desire for knowledge as a basic human tendency, giving curiosity a foundational place in the movement from perception toward understanding.
Source note: Metaphysics, Book I, chapter 1, W. D. Ross translation; the work opens with this claim before discussing sensation, memory, experience, art, and knowledge.
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“Diversity repels; likeness attracts.”
The concise axiom is one premise in Boethius’s metaphysical argument: things are described as tending toward what is like them, not as a modern empirical rule about human attraction or relationships.
Source note: How Substances Can Be Good in Virtue of Their Existence Without Being Absolute Goods (De Hebdomadibus), preliminary proposition IX, H. F. Stewart / E. K. Rand 1918 edition, Project Gutenberg #13316. Kept as a historical metaphysical premise, not social-science evidence.
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“The devil can cite Scripture for his purpose.”
Voice: Fictional character · Antonio
Even respected language can be quoted selectively, so a citation should be judged by context and purpose rather than authority alone.
Source note: The Merchant of Venice, Act 1, Scene 3.
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“There is nothing either good or bad, but thinking makes it so.”
Voice: Fictional character · Hamlet
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.
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“Reading is thinking with some one else's head instead of one's own.”
Reading supplies another mind’s thought, but Schopenhauer warns that consuming ideas should not replace the work of forming one’s own connected judgment.
Source note: Essay “On Books and Reading,” in a public-domain English collection of Schopenhauer’s essays.