Aristotle 384-322 BCEAristotle was one of the world's greatest thinkers, whose profound influence on western philosophy and philosophical terminology continues to this day. Born in Stagira, at that time in Macedonia, in 384 BCE, the son of a doctor who was physician to the Royal Family, he studied for 20 years at Plato's Academy in Athens, before being invited by King Philip II of Macedon to become tutor to his son Alexander (‘the Great’).
Returning to Athens in 335 BCE, Aristotle founded his own philosophical school, the Lyceum, and his surviving works are considered to be his lecture notes, collected and edited by his pupils and others during the centuries after his death. His best known philosophical works are the Metaphysics, de Anima (on the Soul), Politics, and Ethics. Aristotle's interests did not however end with philosophy - he wrote extensively on topics as diverse as education, psychology, grammar and linguistics, and on different aspects of science, particularly biology, and he put forward a cosmology to explain the movements of the heavenly bodies which was not superseded until Ptolemy. But as Jonathan Barnes points out, Aristotle has not always had a good press. Because his works were never edited for publication as connected narratives, Aristotle is difficult to read. Perhaps partly for this reason, since antiquity his writings have been the subject of endless critical analysis and comment, a process still gathering momentum at the beginning of the twenty-first century.
Aristotle's writings (the Nicomachean and Eudemian Ethics in particular) inspired St Thomas Aquinas, who in his great work Summa Theologiae set out to reconcile Aristotle's system of logic and natural law with the Christian worldview and, through Aquinas, the pagan Aristotle can be seen to have influenced Roman Catholic theology through the centuries to the present day.
In the Metaphysics Aristotle is concerned to discover the first principles or causes of things (arche). The true essence of a thing consists in its function rather than in the matter of which it is made. With this principle in mind, as a biologist, Aristotle was primarily interested in discovering how things are as they are, rather than why they exist as they do. Rejecting Plato's theory of forms or ideas, he considered that a thing which does not physically exist cannot in any coherent sense be susceptible to discussion. His scientific works are thus attempts, grounded in empirical observation, to account for phenomena.
However, as scientists are still inclined to do, Aristotle was not above selecting evidence to fit his pre-existing pet theories. Nonetheless, Aristotle was a meticulous observer of the natural world and some of his recorded observations of fish and other sea creatures were not subsequently rediscovered and proved until the middle of the nineteenth century. His taxonomy of plants and animals anticipates that of Linnaeus...