p. 178
प्रमादं वै मृत्युमहं ब्रवीमि सदाप्रमादममृतत्वं ब्रवीमि ॥ ४ ॥
In plain words
Heedlessness — that, I say, is death. Vigilance that never lapses — that, I say, is deathlessness.
Close to the Sanskrit
Heedlessness indeed I call death; ever-vigilance I call immortality.