These are the over two hundred kinds of knowledge that arise in one who develops concentration by mindfulness of breathing with sixteen grounds

… the earliest extant, detailed commentary on Buddhist meditation available in an Indic language

The Path of Discrimination was a key influence on later meditation manuals (such as the medieval Visuddhimagga) and is the oldest such commentary in existence, giving us a rare insight into the early Indian commentarial and meditation traditions.

For a translation of the entire Paṭisambhidāmagga, see SuttaCentral