Wikipedia about: Vipassana thinking
Vipassanā is a Pali word from the Sanskrit prefix "vi-" and verbal root paś. It is often translated as "insight" or "clear-seeing," though, the "in-" prefix may be misleading; "vi" in Indo-Aryan languages is equivalent to the Latin "dis." The "vi" in vipassanā may then mean to see into, see through or to see 'in a special way.'
Henepola Gunaratana defined Vipassanā as:
The suttas contain traces of ancient debates about the interpretation of the teachings, and early classifications and hierarchies. Out of these debates developed the idea that bare insight suffices to reach liberation, by bare insight alone in the Three marks of existence , namely dukkha, anatta and anicca. This is in contradiction with the Four Noble Truths and the Noble Eightfold Path, in which the Buddhist path starts with insight, to be followed by practices to cultivate the mind and reach Nirvana.
The Sthaviravada emphasized sudden insight:}}
The Mahasanghika had the doctrine of ekaksana-citt, "according to which a Buddha knows everything in a single thought-instant".
The emphasis on insight is also discernible in the Mahayana-tradition, which emphasises prajna:}}
Although Theravada and Mahayana are commonly understood as different streams of Buddhism, their practice too may reflect emphasis on insight as a common denominator:}}}}
The emphasis on insight is also discernible in the emphasis in Chán on sudden insight, though in the Chán-tradition this insight is to be followed by gradual cultivatio