Why Birth and Death?
Birth and Death occurs at all stages of evolution to proceed to the next evolutionary stage. In the stage of Man also there is repeated life and birth and through each cycle of birth and death (Samsaara), he or she evolves to the next level.
Birth and death is a purification process of giving up the lower tendencies of the previous stage. Every experience of pain and suffering drives the tendency to shed the tendencies that was accumulated from the previous stage of evolution. We have already discussed that the causal body (green) has all the tendencies and impressions. These impressions are worked out by converting them into desires and uprooting that impression.
This can be explained with the following analogy. Suppose if you want to destroy weeds in your home garden, it is difficult to find the seeds of the weeds in the soil and throw them away. Instead, you allow them to sprout and grow to a state where you can easily pluck and destroy it. But care should be taken that you do not allow the weed to grow fully and allow it to mature and bear fruits and drops more seeds into the soil. Then in the next seasonal "cycle" you end with lots of weeds. Similarly we have these big causal body with the impressions and tendencies (seeds) which we have to reduce to complete our journey of knowing the Self. Instead of using the desires to reduce our size of causal body which is full of seeds of impressions, we try to add up. This choice or free will, we possess can decide when we can extinguish the causal body and realize the Self.
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