Buddhism is about avoiding reincarnation. Every time you are born, you will die, with the added possibility of seeing your parents die (again), disease and old age as well.
[The Buddha said:] “What do you think, monks: Which is greater, the tears you have shed while transmigrating and wandering this long, long time – crying and weeping from being joined with what is displeasing, being separated from what is pleasing – or the water in the four great oceans?”
“As we understand the Dhamma taught to us by the Blessed One, this is the greater: the tears we have shed while transmigrating and wandering this long, long time – crying and weeping from being joined with what is displeasing, being separated from what is pleasing – not the water in the four great oceans.”
"Excellent, monks. Excellent. It is excellent that you thus understand the Dhamma taught by me.
"This is the greater: the tears you have shed while transmigrating and wandering this long, long time – crying and weeping from being joined with what is displeasing, being separated from what is pleasing – not the water in the four great oceans.
– Assu sutta, Samyutta Nikaya 15.3
Reincarnation has no purpose. It is an effect which arises from previous causes. If you attained nirvana in your previous life then you are not reborn. If you failed to attain nirvana in your previous life then you come back for another go round.
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