For which I am an ambassador in bonds
The character the apostle bore was that of an ambassador; and he was an ambassador from and for Christ, in his room and stead; he represented him, he was sent by him, and entrusted by him with the Gospel; he gave him it, and a commission to preach it, and furnished him with qualifications for it; such as knowledge and faithfulness wisdom and prudence, courage and greatness of mind; and made his embassy successful: and he was chiefly an ambassador to the Gentiles, which showed great condescension in Christ to send him to them, and base ingratitude in the despisers and rejecters of the Gospel, for which he was an ambassador; for the embassy Christ's ministers are sent on, is the embassy of the Gospel of peace: their business is to declare that men by nature are enemies to God; that peace is made by the blood of Christ for such; by which means they are made useful to conciliate the minds of men to God's way of salvation and to bring them to submit to his government and laws: and when he adds, "in bonds", or "in a chain", he means, that he was in such circumstances, not for any crime, but for the Gospel, for which he was an ambassador; and therefore was not ashamed of his bonds, or chain, but rather gloried in them; and he makes mention of them to engage persons to a regard to him as an ambassador, and to his embassy; for an ambassador, especially an ambassador of Christ, that comes with his Gospel, and more especially that is suffering for it, ought to be received, heard, and honoured.
That therein I may speak boldly as I ought to speak;
that is, the apostle beseeches the saints to pray for him, that since he was an ambassador for the Gospel, and in bonds, that he might speak in it, or rather of it boldly and freely; that he might have both liberty from his bonds, and liberty in his soul, and freedom of speech; and that he might use boldness in delivering his message, as became an ambassador of Jesus Christ.