| | It is literally via the 3 Characteristics, these are the doors to liberation
One who, at the stage of advanced insight, contemplated things as not-self, acquires the emptiness concentration on arriving at the path and fruit (because he has seen things as empty of self); one who contemplates things as impermanent acquires the signless concentration (because he has seen things through the “sign of permanence”); one who contemplates things as suffering acquires the undirected concentration (because he has no leaning to things seen as painful) |