“The test of the worth of a school is not the amount of knowledge it imparts, but the self-activity it calls forth.”

No. 8.
Aphorisms (1930)

Original: Nessuna quantità di potere o di denaro varranno mai quanto la libertà.
Source: prevale.net

Friedrich Schleiermacher, On The Social Element in Religion (1799), The German Classics of the Nineteenth and Twentieth Centuries, Volume 5 http://www.gutenberg.org/ebooks/12888
Context: But the imparting of religion is not to be sought in books, like that of intellectual conceptions and scientific knowledge. The pure impression of the original product is too far destroyed in this medium, which, in the same way that dark-colored objects absorb the greatest proportion of the rays of light, swallows up everything belonging to the pious emotions of the heart, which cannot be embraced in the insufficient symbols from which it is intended again to proceed. Nay, in the written communications of religious feeling, everything needs a double and triple representation; for that which originally represented, must be represented in its turn; and yet the effect on the whole man, in its complete unity, can only be imperfectly set forth by continued and varied reflections. It is only when religion is driven out from the society of the living, that it must conceal its manifold life under the dead letter. Neither can this intercourse of heart with heart, on the deepest feelings of humanity, be carried on in common conversation.

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 613

Source: Speak

The Divine Commodity: Discovering A Faith Beyond Consumer Christianity (2009, Zondervan)

Nobel Prize autobiography (1998)
Context: Bell Labs had been a kind of holy place of solid state physics since the 1950's when it was built up by Shockley after the invention of the transistor. I had no idea at the time of the significance of this placement, but I did notice during my job talk that everybody understood what I was saying immediately — this had never happened before — and that the audience had an irresistible urge to interrupt, heckle, and argue about the subject matter loudly among themselves during the talk so as to lob hand grenades into it, just like back-benchers do in the House of Commons. Being a combative person I rather liked this and lobbed a few grenades of my own to maintain control of my seminar. I later came to understand that this heckling was a sign of respect from these people, that the ability to handle it was a test of a person's worth, and that polite silence from them was an extremely bad sign, amounting to Pauli's famous criticism that the speaker was "not even wrong."

Maxim 504, trans. Stopp
Variant translation: Everything that emancipates the spirit without giving us control over ourselves is harmful.
Maxims and Reflections (1833)

Source: The Information: A History, a Theory, a Flood