Knowing a lot doesn't teach understanding.

The source

"Knowing a lot doesn't teach understanding." Heraclitus said it in Fragment B40 (Diels-Kranz). Translated from the original Greek by Spartan Surfers.

"πολυμαθίη νόον έχειν οὐ διδάσκει"

Original Greek, Fragment B40 (Diels-Kranz). Greek: Diels-Kranz fragment text via el.wikisource.

Who said it

Heraclitus (c. 535–475 BC). Philosopher of Ephesus who taught that everything flows. Only fragments of his book survive.

Questions

Who said "Knowing a lot doesn't teach understanding."?

Heraclitus (c. 535–475 BC). Source: Fragment B40 (Diels-Kranz).

What is the original Greek?

πολυμαθίη νόον έχειν οὐ διδάσκει. Translated from the original Greek by Spartan Surfers.