The subject appears to be identified with the power of seeing in egoism. Dwelling upon pleasure is attachment. Dwelling upon pain is aversion. Flowing by itself even in the wise is the established clinging to life. These are overcome by reversing propagation to the subtle.
Concentration overcomes their effects.
Obstacles result in action patterns which cause suffering in this life and the next. Existing roots ripen into species, life, and experience. They bear fruit as pleasure or pain caused by virtue or vice. By reason of the pains of change and the opposing effects of the qualities, all are suffering to the discriminating. Avoidable is the suffering which has not yet come.