The entry that I liked in Linked by Albert-Laszlo Barabasi:
But credit for the success of Christianity in fact goes to an orthodox and pius Jew who never met Jesus. While his Hebrew name was Saul, he is better known to us by his Roman name, Paul. Paul’s life mission was to curb Christianity. He traveled from community to community persecuting Christians because they put Jesus, condemned by the authorities as a blasphemer, on the same level as God. He used scourging, ban, and excommunication to uphold the traditions and to force the deviants to adhere to Jewish law. Nethertheless, according to historical accounts, this fierce persecutor of Christians underwent a sudden conversion in the year 34 and became the fiercest supporter of the new faith, making it possible for a small Jewish sect to become the dominant religion in the Western world for the next 2,000 years.
What I got out of this: people change. Sometime for better, sometime for worse. Big was always small somewhere in the past.