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The Four Causes (abstract, pdf) The Aristotelian doctrine of four causes naturally arises from the combination of the two distinctions (a) between things and changes, and (b) between that which potentially is a certain thing or change and what it potentially is.
The biological species concept rests on the notion of reproduction, which we can only apply if we know what counts as a result of successful reproduction. Therefore, it presupposes the typological species concept and cannot, as Ernst Mayr thinks, replace it. Descartes uses 'conscientia' in the traditional sense, roughly meaning 'moral conscience'.
According to Descartes, a thought is what happens in us if and insofar as we are conscious of it. This means that what happens in us is a thought only in a certain respect. It is something other than a thought, namely consciousness of a thought, in another respect. Virtues are not character traits of individual agents, but generic ways of acting; this is why Anscombe found them important, and this is how Aristotle talks about them.
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