I know what "continuity" means in the dictionary, I don't know which aspects of the problem at hand should be continuous and why. Continuity of knowledge (and,

I know what "continuity" means in the dictionary, I don't know which aspects of the problem at hand should be continuous and why. Continuity of knowledge (and, if yes, theoretical knowledge, tacit knowledge)? Continuity of culture of reading and writing (in general, or when applied to learning and knowledge generally)? Continuity of history (as a specific branch of knowledge)? Continuity of culture? Continuity of whole nations (as carriers of culture and history)?