“… only a fraction of book learning will seep into practical life anyhow; and the more foolish the theory, the less of it.”
Source: On War (1832), Book 6, Chapter 17.
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Carl von Clausewitz 68
German-Prussian soldier and military theorist 1780–1831Related quotes

Milgrom and Roberts, 1987, p. 185
Source: "Theory, experiment and economics," 1989, p. 151.

The Shoe workers' journal, Volume 16 (1915) p. 4
Variant: What does labor want? We want more school houses and less jails. More books and less guns. More learning and less vice. More leisure and less greed. More justice and less revenge. We want more … opportunities to cultivate our better natures.

“Only the foolish learn from experience - the wise learn from the experience of others.”
Nur der Dumme lernt aus Erfahrung, der Kluge aus der Erfahrung der anderen!
Alan Turing

“A learned fool is more foolish than an ignorant one.”
Un sot savant est sot plus qu'un sot ignorant.
Act IV, sc. iii
Les Femmes Savantes (1672)

“From my own kind I only learn
How foolish comfort is”
Comfort.

“The theory of the Text can coincide only with a practice of writing.”
Conclusion
From Work to Text (1971)
Context: The discourse on the Text should itself be nothing other than text, research, textual activity, since the Text is that social space which leaves no language safe, outside, nor any subject of the enunciation in position as judge, master, analyst, confessor, decoder. The theory of the Text can coincide only with a practice of writing.