George Fox encourages all believers who are suffering for the truth to fully surrender to God's power, which will ultimately lead to freedom and victory over persecution. He emphasizes the importance of remaining faithful and valiant in the face of suffering, urging them to focus on God's power rather than their trials. Fox reassures that their faithfulness will not only bring peace and unity with God but also impact those who are imprisoned by their own struggles. He calls for perseverance in the life and wisdom of the Lord, promising a crown of eternal life for those who endure. Ultimately, he inspires believers to trust in God's power to overcome and achieve victory.