John is warning us of the power & alluring pull of Babylon…the siren song of seduction calling us to love the things of the world rather than loving Jesus. This world system opposed to God wants us to follow it…drawing us away from Christ with all its glitz & glamor, money & power, immorality & lust. In II Corinthians 6:17, Paul quotes portions from both Isaiah 52:11 & Ezekiel 20:34 concerning Babylon when he wrote, “Therefore go out from their midst and be separate from them, says the Lord.” He had just told the Church not to be yoked with unbelievers…to be in the world but not of it… and instead to separate themselves from anything that would cause them to love the world more than they loved God.