"It takes 20 years to build a reputation and five minutes to ruin it. If you think about that, you’ll do things differently."
Warren Buffett's Core Mental Models & Philosophy
The cognitive frameworks and foundational principles behind their legacy
Circle of Competence
Knowing what you understand deeply and staying rigorously within that boundary, rather than chasing every shiny trend outside it.
Long-Horizon Compounding
Patience and consistency over decades create miraculous wealth, while emotional impulsiveness destroys it.
Key Philosophical Themes
- Reputation takes 20 years to build and 5 minutes to ruin
- Being greedy when others are fearful, and fearful when others are greedy
- Investing in oneself as the highest-return investment possible
Most Celebrated Quotes
Verified historical attributions with direct 4K design studio export
"Be fearful when others are greedy, and greedy when others are fearful."
"The most important investment you can make is in yourself."
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Open Quote Maker StudioFrequently Asked Questions About Warren Buffett
What is Warren Buffett's #1 rule of investing?
Rule No. 1: Never lose money. Rule No. 2: Never forget rule No. 1. This emphasizes downside risk protection before seeking upside returns.
What is Buffett's advice on reputation?
Buffett warned: 'It takes 20 years to build a reputation and five minutes to ruin it. If you think about that, you'll do things differently.'





