Appearance and disappearance of vibrating manifestations are the process of becoming and cessation. The concentration developed in this way becomes more and more intense until a meditator becomes aware of swiftly sweeping changes all over the body. When these swiftly sweeping changes are seen with insight, the characteristic of anicca becomes most obvious, and accordingly the characteristics of dukkha and anatta are also seen. It is not necessary to utter them by word of mouth. Vipassana meditation means being mindful of what actually happens.
Mindfulness develops day by day, and consequently, meditators gain penetrating insight.
This realization is as evident and satisfying as quenching your thirst by drinking water. The meditator who has realized the Path and Fruition State has realized it by himself in this present lifetime, not hereafter. With firm faith and unflagging energy, be mindful of the contact of the breath with the nostrils without any let-up or break. Do not waver. Do not procrastinate.