The perception of suffering in impermanence, monks, when developed and frequently practiced, is of great fruit and benefit, leading to the deathless, having the deathless as its culmination, thus it has indeed been said. Why has this been said? Monks, when a monk frequently dwells with his mind imbued with the perception of suffering in impermanence, in laziness, in slackness, in laxity, in negligence, in lack of striving, in lack of introspection, a sharp perception of fear arises, just as, monks, for a murderer with a drawn sword.

If, monks, when a monk frequently dwells with his mind imbued with the perception of suffering in impermanence, in laziness, in slackness, in laxity, in negligence, in lack of striving, in lack of introspection, a sharp perception of fear does not arise.

It is like, monks, a murderer with a drawn sword. It should be understood by a monk, My perception of impermanence is undeveloped, I see no difference between before and after, my power of development has not been attained. Thus, he is aware there.

However, monks, if a monk frequently dwells with a mind imbued with the perception of impermanence and suffering, and if a sharp perception of fear arises due to laziness, idleness, slackness, negligence, and lack of reflection, it is like, monks, a murderer with a drawn sword. It should be understood by a monk, My perception of impermanence and suffering is well developed, I see a difference between before and after, my power of development has been attained. Thus, he is aware there.

The perception of impermanence and suffering, monks, when developed and frequently practiced, is of great fruit and benefit, leading to the deathless, having the deathless as its culmination, thus it has been said in relation to this.