Self-Knowledge
Understanding your own strengths, weaknesses, capabilities, limitations, and especially the boundaries of your knowledge—including unknown unknowns—so you can operate effectively within your circle of competence.
THE IDEA
Self-Knowledge
Know thyself. —INSCRIPTION ON THE TEMPLE OF APOLLO AT DELPHI
Self-knowledge is about knowing your own strengths and weaknesses. You must know what you can do and what you can’t; your powers and limitations, your strengths and vulnerabilities, what’s in your control and what isn’t. You know what you know, and what you don’t know. And you know, moreover, that you have cognitive blind spots—that there are things you don’t know, and you don’t know you don’t know them—what Donald Rumsfeld famously called “unknown unknowns.”
If you want to better understand your level of self-knowledge, ask yourself how many times a day you utter the phrase “I don’t know.” If you never say, “I don’t know,” you’re probably dismissing things that surprise you or explaining away outcomes instead of understanding them.
Understanding what you do and don’t know is the key to playing games you can win.
Key Principles
- Know Your Strengths and Weaknesses: Honestly assess your capabilities and vulnerabilities.
- Acknowledge Ignorance: Be comfortable saying “I don’t know” to avoid overconfidence.
- Understand Your Circle of Competence: Stick to areas where you have deep knowledge and advantage.
- Recognize Blind Spots: Accept that there are things you are unaware of not knowing.
When to use it
An investor decides which assets to allocate capital to by rigorously defining what industries and strategies they understand deeply.
A student chooses a research topic by acknowledging which subjects they have sufficient background in versus areas requiring too much foundational learning.
A job seeker evaluates a career change opportunity by honestly assessing whether their existing skills translate to the new role or if they are entering a domain of unknown unknowns.
A leader builds a team by first auditing their own gaps in knowledge and then hiring people whose strengths complement those weaknesses.
FROM THEORY TO EVERYDAY LIFE
In practice
Investing within your circle of competence
A successful real estate investor is pitched on a compelling private equity deal. Despite the pitch's strength and trust in the pitcher, he declines, saying, “I don’t know anything about that space. I like to stick to what I know.” He knows his circle of competence is real estate, and chooses to assess opportunities within that domain rather than rely on the appeal of an unfamiliar deal.
The danger of never saying 'I don't know'
A manager who never admits ignorance dismisses unexpected project failures by blaming external factors instead of investigating real causes. By explaining away outcomes, they miss learning opportunities and repeat mistakes.
A MOMENT TO REFLECT
Put it to work.
How often do you say 'I don't know' in a day? If rarely, what might you be dismissing or explaining away?
What are the boundaries of your personal circle of competence? In what areas do you truly have an edge?
Can you identify a recent situation where you ventured outside your circle of competence? What was the outcome and what did you learn?
Often confused with
CONTINUE THE CONVERSATION
Source texts
- Clear Thinking Turning Ordinary Moments into Extraordinary Results (Shane Parrish)