Critical Thinking

Critical thinking is the ability to analyze information objectively, identify flaws in reasoning, and arrive at well-supported conclusions. It is perhaps the most important intellectual skill a human can develop.

What Critical Thinking Is (and Isn’t)

Critical thinking is not:

Being cynical or contrarian
Criticizing everything reflexively
Assuming everyone is lying

Critical thinking is:

Asking good questions
Evaluating evidence fairly
Recognizing the limits of your own knowledge
Distinguishing facts from opinions and values
Identifying logical fallacies
Holding conclusions proportionally to the strength of evidence

The Elements of a Good Argument

A strong argument has:

A clear claim — what is being asserted?
Evidence — what supports the claim?
Reasoning — how does the evidence connect to the claim?
Acknowledgment of counterarguments — has the arguer addressed opposing views?
Limitations — what doesn’t this argument address?

Common Logical Fallacies

Fallacies are flawed reasoning patterns that appear valid but aren’t. Recognizing them makes you much harder to mislead.

Fallacy	Description	Example
Ad hominem	Attacking the person, not their argument	”You can’t trust his climate views — he drives an SUV”
Straw man	Misrepresenting someone’s argument to attack it more easily	Taking an extreme version of someone’s position and arguing against that
False dichotomy	Presenting only two options when more exist	”You’re either with us or against us”
Appeal to authority	Using someone’s status to validate a claim without evidence	”This doctor says vaccines are dangerous” (not how science works)
Slippery slope	Assuming one event will inevitably lead to extreme outcomes	”If we allow X, eventually we’ll have Z” (without showing the causal chain)
Anecdotal evidence	Using one example to draw a general conclusion	”My grandfather smoked all his life and was fine, so smoking isn’t dangerous”
Correlation = causation	Assuming that because two things happen together, one caused the other	(Why Math Matters)
Bandwagon	Something is true/right because many people believe it	”Everyone knows that…”
Circular reasoning	Using the conclusion as part of the evidence	”The Bible is true because the Bible says so”

Intellectual Humility

Being a good thinker requires being genuinely open to being wrong:

Acknowledge what you don’t know — “I’m not sure” is a completely valid position
Update your beliefs when evidence changes — this is a sign of intelligence, not weakness
Seek out views that challenge yours — this is uncomfortable but essential
Notice your emotional reactions — strong emotion about a topic often signals a blind spot

How to Disagree Well

Disagreement is inevitable and can be productive:

Focus on the argument, not the person
Steelman your opponent’s position — present the strongest version of their view before critiquing it
Ask questions rather than making accusations
Acknowledge what they got right before explaining where you disagree
Be willing to change your mind — and say so if you do

“The measure of intelligence is the ability to change.” — Albert Einstein (attributed)