For all Shakspeare's great creations are like works of nature, subjects of Unexhaustible study.
"Biographical Essays"
Thomas de Quincey
Shakespeare opens a mine which contains gold and diamonds in Unexhaustible plenty, though clouded by incrustations, debased by impurities, and mingled with a mass of meaner minerals.
"Eighteenth Century Essays on Shakespeare"
D. Nichol Smith