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Australia is properly speaking an island, but it is so much larger than every other island on the face of the globe, that it is classed as a continent in order to convey to the mind a just idea of its magnitude.

Charles Sturt (1834). “Two expeditions into the interior of Southern Australia: during the years 1828, 1829, 1830 and 1831 with observations on ... New South Wales”, p.12
Australia is properly speaking an island, but it is so much larger than every other island on the face of the globe, that it is classed as a continent in order to convey to the mind a just idea of its magnitude.