'Chains' in the Bible

So it is right for me to take thought for you all in this way, because I have you in my heart; for in my chains, and in my arguments before the judges in support of the good news, making clear that it is true, you all have your part with me in grace.

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].

The former insincerely preach Christ from selfish ambition, thinking that they add affliction to my chains;

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