In his classic study,The Great Chain of Being, Arthur Lovejoy delineated a complex set of concepts and assumptions which referred to the perfection of God and the fullness of creation. In attempting to distil the basic or ‘unit idea’ which constituted this pattern of thought, he focused on the assumption that ‘the universe is aplenum formarumin which the range of conceivable diversity ofkindsof living things is exhaustively exemplified’. He called this the ‘principle of plenitude’. Lovejoy argued that this idea implied (...) two others—continuity and gradation—and that together these reflected a pre-occupation with the ‘necessity of imperfection in all its possible degrees’, a concern which had pervaded Western thought since Plato and gave rise to the powerful ontology known as the ‘great chain of being’. (shrink)