20. The difference which there may be between the Indians who were conquered by arms and those who voluntarily subjected themselves to our sway (as were those of these islands) is also found in the said regulation of rates, by which the latter will pay but one-half as much as the former; for this circumstance that I have mentioned does not relieve them from the obligations and burdens of vassals--although on account of it they have the right to be treated with more clemency, as they have been treated hitherto, and will be in the future--paying the two pesos as tribute, in order that his Majesty and the other vassals need not defray the expenses to which the people of these islands ought to contribute, since these conduce to their spiritual and temporal welfare, and to the preservation and security of these dominions. 21. Besides this, it ought to be borne in mind that, from the first years of this conquest until the one in which we now are, nearly all the provinces have at various times rebelled and risen in arms; and not one of our authors doubts that for this kind of offense the Indians ought to be punished by an increase of their tributes, that this may serve them as a warning and example; for they [thus] lost the right to be treated with the mildness which their first voluntary submission deserved. If the Spaniards had proceeded after this fashion in these islands, it would have been an easy matter to increase the tributes, in order to save the situados. Moreover, with the examples in this war [i.e., with the English] we have most rightful cause for punishing, by some such means, the traitorous and revolted provinces, by [imposing] not only the two pesos of tribute, but much more, in order to make some distinction between the Indians who have continued faithful to our king and those who have rebelled and acted disloyally.