 there is a fitness or suitableness of certain circumstances to certain persons, and an unsuitableness of others; founded in the nature of things and the qualifications of persons, antecedent to all positive appointment whatsoever; also that from the different relations of different person one to another, there necessarily arises a fitness or unfitness of certain manners of behaviour of some persons towards others: it is as manifest, as that the properties which flow from the essences of different mathematical figures, have different congruities or incongruities between themselves; or that, in mechanics, certain weights or powers have very different forces…. (Clarke 1706 [BM: 192–3]) 