This book discusses in detail the 16-step method of meditation based on mindfulness with breathing first presented by the Buddha in the Anapanasati Sutta, which is here interpreted and explained by Buddhadasa Bhikkhu for the benefit of modern-day meditators. Budhadasa's presentation follows the Buddha's original formulation closely; he interprets the steps and tries to make them clearer for the practitioner. Like all inspired teachers and orators, he also adds great commentary to the practice, employing innovative and entertaining ways of characterizing human psychology that are at once down-to-earth, stunningly accurate and painfully humorous. Supplementing Buddhadasa's presentation and commentary is the commentary of the translator Santikaro Bikkhu which gives more points for managing practice which are useful.
The 16 steps of Anapanasati proceed from the observation of kaya (body) to the observation of vedana (feeling), citta (mind) and finally dhamma. There are 4 steps of observation in each of the 4 categories, making 4 tetrads. For those who think 16 steps might be too much, Buddhadasa recommends doing just eight steps, focused on the 1st and 4th tetrads. Note that those who take this "shortcut method" of Anapanasati will be practicing something akin to the "bare insight" styles of vipassana that do not focus on the development of higher levels of concentration, and their factors of enlightenment will correspondingly be weaker, whereas those who develop all 4 tetrads will be able to utilize the combined power of (highly developed) concentration and mindfulness to achieve insight with perfected factors of enlightenment. This is because the 16 steps of Anapanasati actually help meditators to develop the factors of enlightenment to a very high degree - specifically, in the 2nd tetrad, rapture and tranquility are developed and perfected; in the 3rd and 4th tetrad, mindfulness, investigation of states, effort, concentration and equanimity all achieve perfection.
Towards the end of the Anapanasati Sutta, the Buddha explained how Anapanasati perfects Satipathana, which perfects the Seven Factors of Enlightenment, which perfects Knowledge and Liberation. So, Buddhadasa is quite right in pointing to Anapanasati as a core method of Satipathana practice. Buddhadasa considers the Anapanasati Sutta as the authoritative text on meditation practice because the Anapanasati Sutta actually lays out an easily practice-able method of meditation, unlike the Sattipathana Sutta which he deems as "just a list of names or dhammas...more than can be remembered." I think Buddhadasa's practical prioritization of the Anapanasati Sutta very wise, however, his dismissal of the Satipathana Sutta should not lead meditators to overlook this Sutta. In fact, the Satipathana Sutta actually gives the larger framework within which the Anapanasati Sutta should be understood. In the Satipathana Sutta, the Buddha was concerned with laying out a meditation method based on "Sati" or "Mindfulness", which can be applied to 4 categories of phenomena (body, feeling, mind, dhamma) taken as meditation subjects. Such "mindfulness meditation" can be developed in various ways. In the Anapanasati Sutta, the Buddha explained in detail one particular way in which meditators can develop their Satipathana practice by combining Mindfulness (Sati) with Breathing (Anapana), a combination that actually improves mindfulness and gives a compact way of practicing all 4 satipathanas.
This original 16-step Anapanasati method of the Buddha is indeed both more concise and more comprehensive than other popular methods of satipathana vipassana being taught today. First, these other contemporary methods might not necessarily highlight or make clear the practical way of progressing from one satipathana to the next like this presentation does. Second, the teachers of these methods often categorize Anapanasati as "samatha meditation" dividing it from "vipassana proper", ignoring the fact that the original Anapanasati method that arose out of the enlightened wisdom of the Buddha is the most perfect and skillful conception of samatha-vipassana ever, with serenity concentration playing an integral part all through the progressive development of insight. Third, unlike contemporary methods that borrow either too narrowly or too comprehensively from the Satipathana Sutta, the original Anapanasati practice is neither too truncated nor too long-winded; the 16 steps cover all essential bases and lead straight to the goal. Therefore, all Buddhist meditators will benefit greatly from studying the Anapanasati Sutta, which is explained so well by Buddhadasa here.
Buddhadassa Bhikku was a wise teacher, an accomplished yogi and a master of the Dhamma. This kind friend points out an authentic path that yields authentic fruit; a path practiced, praised and taught by the Buddha himself. Have faith in the the Fully Enlightened One in whose footsteps Buddhadasa follow - Anapanasati as taught here can lead to the final goal.