Given the question: I know that the answer to the question "What was an issue in the theories?" is in "A core problem in the study of early Buddhism is the relation between dhyana and insight. Schmithausen, in his often-cited article On some Aspects of Descriptions or Theories of 'Liberating Insight' and 'Enlightenment' in Early Buddhism notes that the mention of the four noble truths as constituting "liberating insight", which is attained after mastering the Rupa Jhanas, is a later addition to texts such as Majjhima Nikaya 36.[page needed]". Can you tell me what it is?
The answer is:
the mention of the four noble truths as constituting "liberating insight"