'Chains' in the Bible

Because of my chains [seeing that I am doing well and that God is accomplishing great things], most of the brothers have renewed confidence in the Lord, and have far more courage to speak the word of God [concerning salvation] without fear [of the consequences, seeing that God can work His good in all circumstances].

but the former preach Christ [insincerely] out of selfish ambition [just self-promotion], thinking that they are causing me distress in my imprisonment.