"Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals"
About this Quote
The image does the heavy lifting. A “kingfisher flashing across the pool” isn’t just beauty; it’s speed, surprise, and vanishing point. You don’t track it by staring harder at the water. You catch it by being tuned to the environment, alert to small cues, ready to move before you can fully narrate what you’re seeing. Lawrence’s “irrational tenth” isn’t anti-intellectual; it’s extra-rational: judgment under pressure, improvisation, nerve, timing. The kind of intelligence that looks like instinct because it operates faster than explanation.
His intent is also a quiet indictment of bureaucratic militarism. If you can teach nine-tenths, then armies will always overvalue credentialed competence and mistake procedural fluency for genius. The “test of generals” becomes a test of whether a leader can depart from the book without becoming reckless-a thin line Lawrence knew intimately from guerrilla warfare, where mobility and perception beat mass and routine.
Context matters: as an archaeologist turned wartime operator in the Arab Revolt, Lawrence lived between systems. He admired planning but distrusted its seductions. The quote defends a rare kind of authority: not the certainty of rules, but the courage to act when rules stop working.
Quote Details
| Topic | War |
|---|---|
| Source | Seven Pillars of Wisdom (T. E. Lawrence, 1926) , contains the line commonly cited as: "Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals." |
| Cite | Cite this Quote |
Citation Formats
APA Style (7th ed.)
Lawrence, T. E. (n.d.). Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals. FixQuotes. https://fixquotes.com/quotes/nine-tenths-of-tactics-are-certain-and-taught-in-78455/
Chicago Style
Lawrence, T. E. "Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals." FixQuotes. Accessed February 2, 2026. https://fixquotes.com/quotes/nine-tenths-of-tactics-are-certain-and-taught-in-78455/.
MLA Style (9th ed.)
"Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals." FixQuotes, https://fixquotes.com/quotes/nine-tenths-of-tactics-are-certain-and-taught-in-78455/. Accessed 2 Feb. 2026.





