Purpose of describing the fatal signs

The teaching on rishta is called a secret handed down through the canon of great sages who knew the highest truth; it is set out for people devoted to good contemplation, not for those caught in worldly delusion, who can neither perceive the signs nor use them. The commentary defines death as the soul's passage to another state when its life span is exhausted, adds that poison and the like are also called death in a measure, and says the author will speak so that the fear of death does not arise.