Extremities of life and it's process
Birth of a son, death of another
With love I caress both mothers

from Common (Ft. John Legend) – The Believer Lyrics on Rap Genius

Life and death are the two extremities of life. Common is saying that love will help in both instances. It’s a nice way to connect the circle of life. These lines also reference the common belief that when one person dies another is born.

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