Chalk Charcoal and Clay
By these three substances are beautifully symbolized the three qualifications for the servitude of an Entered Apprentice — freedom, fervency, and zeal. Chalk is the freest of all substances, because the slightest touch leaves a trace behind. Charcoal, the most fervent, because to it, when ignited, the most obdurate metals yield; and clay, the most zealous, because it is constantly employed in man's service, and is constantly reminding us that from it we all came, and to it we must all return. In the earlier lectures of the last century, the symbols, with the same interpretation, were given as "Chalk, Charcoal, and Earthen Pan."
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This page is adapted from the Glossary at Phoenixmasonry — Used with permission.