Unfortunately, many meditation traditions split samadhi and sati, linking concentration practice exclusively to śamatha, and mindfulness practice exclusively to vipassanā.23 This creates all sorts of problems and misunderstandings, such as emphasizing mindfulness at the expense of stable attention, or vice versa. Stable, hyper-focused attention without mindfulness leads only to a state of blissful dullness: a complete dead end.24 But, just as stable attention without mindfulness is a dead end, the opposite is also true. You simply cannot develop mindfulness without stable attention. Until you have at least a moderate degree of stability, “mindfulness practice” will consist mostly of mind-wandering, physical discomfort, drowsiness, and frustration. Like two wings of a bird, both stable attention and mindfulness are needed, and when cultivated together, the destination of this flight is śamatha and vipassanā.