“If you can't explain it simply, you don't understand it well enough.”
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About this quote
Stop hiding gaps behind jargon or long-winded sentences; clarity shows real mastery. Force yourself to break ideas into plain steps, ask the hard questions, and teach what you claim to know. Make simplification a habit—it's the quickest way to expose and fix weak understanding.
When to use it
- In a team meeting, ask a colleague to sum up their plan in one sentence—if they can't, push them to clarify before you sign off.
- When studying, try teaching the concept to a friend in plain terms; if you stumble, you know what to study next.
- Before a presentation, rewrite your main point so a non-expert can repeat it back; that reveals what you actually grasp.
- During code review, demand a simple explanation of the algorithm; vague answers mean the design needs work.

