True marble is a metamorphic form of limestone, produced by heat and pressure. Pressure is a powerful factor. It leads to consequences which, once started, cannot be controlled.
 Ayn Rand, The Fountainhead (1943). copy citation

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Author Ayn Rand
Source The Fountainhead
Topic pressure heat
Date 1943
Language English
Reference
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Weblink https://archive.org/stream/TheFountainhead/The-Fountainhead_djvu.txt