The only true wisdom is in knowing you know nothing
Humility about one's own ignorance is the beginning of wisdom
“Socrates' insight: confidence in one's knowledge is often the greatest obstacle to learning.”
Origin: Socrates (as recorded by Plato in the Apology)
Consciousness is the one thing that cannot be doubted
“Descartes' foundation: even if all else is illusion, the thinking self must exist.”
Origin: René Descartes, Discourse on the Method (1637)
The unexamined life is not worth living
Reflection and self-knowledge are essential to a meaningful life
“Socrates' defense at his trial—he would rather die than stop philosophizing.”
Origin: Socrates at his trial, as recorded in Plato's Apology
Understanding gives one the ability to act effectively
“Bacon's insight anticipates the Scientific Revolution's faith in knowledge.”
Origin: Francis Bacon, Meditationes Sacrae (1597)
The limits of my language mean the limits of my world
What we can think is bounded by what we can express
“Wittgenstein's insight: expand your vocabulary, expand your world.”
Origin: Ludwig Wittgenstein, Tractatus Logico-Philosophicus (1921)
Those who cannot remember the past are condemned to repeat it
Historical ignorance leads to recurring mistakes
“Santayana's warning: study history or relive its errors.”
Origin: George Santayana, The Life of Reason (1905)
I know that I know nothing
The Socratic paradox—awareness of one's own ignorance
“The wisest know how little they know.”
Origin: Socrates, as paraphrased across Plato's dialogues
Man is the measure of all things
Truth and value are relative to human perception
“Protagoras' relativism: what is true for you may not be true for me.”
Origin: Protagoras (5th century BCE)