How do the four noble truths correlate to the conventional and deepest natures of mental activity that mahamudra deals with? The first two noble truths are what we call “fleeting stains” of mental activity, which are not the nature of mental activity. The aggregate factors that comprise our experience of suffering and the causes for them, as fleeting stains, are the content of mental activity. They are the kinds of mental activity we experience daily (seeing, thinking, being angry, being happy) and the objects of that mental activity. Through mahamudra meditation, we are not achieving a true stopping of the conventional or deepest natures of mental activity, we are achieving a true stopping of a certain type of content of the mental activity – true suffering and its true causes.