http://www.w3.org/ns/prov#value | - It is a generalization of the 'ought' implies 'can' principle: if I morally ought to do X, then it must be in my power to do X. Contrapositively, if it is not in my power to do X, then I have no moral obligation to do X. My principle is a generalization of the familiar Kantian principle because it covers not only the obligatory but also the supererogatory.
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