In the Bible, in John 3:3, Jesus says: "No one can enter the kingdom of God unless he is born of water and the Spirit." In the case of those of us who are born-again, our first birth took place when the uterus of our mother ruptured; and along with the water in the uterus, we came out as a baby. This was our first birth from water. Our second birth, according to 1 John 5:18 and 1 John 3:9, takes place when a baby or an adult becomes a child of God through a second birth enacted by the Holy Spirit, just as Christ was conceived in the womb of Mary, His mother. This means that when a follower of Christ becomes a born again Christian, he has not even a trace of sin, just as Christ also was when He was conceived. In John's letter, 1 John 3:9 implies that being born again is a change as profound as if the born-again Christian also were conceived in the womb of his earthly mother by the power of the Holy Spirit, exactly in the same way that Jesus was conceived since there is a commonality in both the births. The commonality is that the seed in both cases is the same--the Holy Spirit.