Everything is capable of change. Customary vs conventional?
‘But in our world, although there is such a thing as natural law, yet everything is capable of change. For example, the right hand is naturally stronger than the left, yet it is possible for some persons to be born ambidextrous; and the same distinction will hold good in all matters; though what sort of things that admit of variation are as they are by nature, and what are merely customary and conventional, it is not easy to see, inasmuch as both alike are capable of change. But nevertheless some things are ordained by nature and others not.’
although there is such a thing as Natural Justice, all rules of justice are variable.
Haha
it is easy3 to see which rules of justice, though not absolute, are natural, and which are not natural but legal and conventional, both sorts alike being variable. The same distinction will hold good in all other matters; for instance, the right hand is naturally stronger than the left, yet it is possible for any man to make himself ambidextrous. [5]
Natural … right hand is stronger than left (typically). But… with training, one can *change* this — although ultimately, the left hand will always be (a bit) weaker than the right.