"You heard of my former way of life in Judaism, how I persecuted the Church of God beyond measure and tried to destroy it." Gal 1:13
How can the early church be both at peace and persecuted? St Paul wants us to realize that when we are in the Spirit, living the Gospel and announcing it with power, fear dissipates. The presence of the Holy Spirit becomes tangible, something we can almost taste, and although we must endure difficult and dangerous trials, we are not overwhelmed.