Wherever people live, they reserve the right to self-rule. That a people should aspire to sovereignty from an aging parent-government is clearly indicative of a collapse of mutual respect, trust and unity between the people and the old government. Such are the annuals of time and of nation-building.
Therefore, when a collective community decides to declare independence, the will of the people must be protected. Throughout history, new nations have come into existence out of the desires of communities to break away from colonial masters, empires and parent-governments that have underperformed for the sovereignty-seeking people.
When attempts to redress have failed and the old-government has physically tried to prevent the exercise of the rights of the complaining people, then a struggle will ensue. What will be the final face of Catalonia's declaration of independence from Spain? Will it be Barcelona against Madrid? Catalan versus Spaniard? Or will the aspirations to independence by Catalans by respected by Madrid? Probably not.
If a people desire and demand sovereignty, history has shown, that they must be willing to fight and to die to attain and to maintain such freedom. New nations will continue to be born. We wish the people of Catalonia happiness, freedom and peace.