Quest2ReasonClimb the mountain, sharpen your mind.

Ideas

Big questions

Pick a question and see how the schools answer it, one line each.

Where do you think knowledge has to start?

14 schools answer this. See every school

Rationalism

Descartes, Spinoza, Leibniz

Reason can reach knowledge the senses never earn on their own.

1637 onward

Empiricism

Locke, Berkeley, Hume

If it did not come through experience, I do not yet have a reason to believe it.

1689 onward

Kantianism

Immanuel Kant

The mind structures experience. We never meet the world with no form of our own.

1781 onward

Pragmatism

Peirce, James, Dewey

I trust an idea when I can see what it does.

1878 onward

Falsafa

Al-Kindi, Al-Farabi, Ibn Sina

A mind can know that it exists with every sense set aside.

c. 1020 CE
Show 9 more schools

Sor Juana’s right to study

Sor Juana Inés de la Cruz

Knowledge is open to anyone who studies, and it can be found anywhere, even in a kitchen.

1691

Scholasticism

Anselm, Thomas Aquinas, Duns Scotus, William of Ockham

Faith and reason can look at the same world. One does not cancel the other by arriving.

c. 1270 CE

Hold every certain view loosely: a dreamer can be sure of waking and still be mistaken.

c. 300 BCE

Madhyamaka

Nagarjuna, Chandrakirti

Every view depends on conditions; use everyday truths without mistaking them for the final word.

c. 150 CE

Feminist philosophy

Wollstonecraft, Gilligan, Noddings, Harding, Crenshaw

Where you stand shapes what you notice, so a fuller picture needs more than one position.

1792 onward

The Sophists

Protagoras, Gorgias and other paid teachers in Athens

Each person is the measure of how things seem, so learn to argue both sides of every question.

c. 450 BCE

Pyrrhonism

Pyrrho of Elis, Sextus Empiricus and Agrippa

When the arguments balance, suspend judgment, and calm follows.

c. 300 BCE

Charvaka

Brihaspati (traditional founder), Purandara and, by some accounts, Jayarashi

Trust only what the senses show; inference and scripture can mislead.

c. 600 BCE onward

Nyaya

Akshapada Gautama

Knowledge comes through reliable means: perception, inference, comparison and trustworthy testimony.

c. 2nd c. CE (text)