As I ought. This clause sets forth more strongly the difficulty, for he intimates that it is no ordinary matter. In the Epistle to the Ephesians, (Ephesians 6:20,) he adds, hina parresiasomai, (that I may speak boldly,) from which it appears that he desired for himself an undaunted confidence, such as befits the majesty of the gospel. Farther, as Paul here does nothing else than desire that grace may be given him for the discharge of his office, let us bear in mind that a rule is in like manner prescribed to us, not to give way to the fury of our adversaries, but to strive even to death in the publication of the gospel. As this, however, is beyond our power, it is necessary that we should continue in prayer, that the Lord may not leave us destitute of the spirit of confidence.

That I may make it manifest - Notes, Ephesians 6:20.

That I may make it manifest - It was a mystery, and he wished to make it manifest - to lay it open, and make all men see it.

That I may make it manifest,.... It being a mystery, a secret, which was hid in God from everlasting, and, during the legal dispensation, was wrapped up in types, and shadows, and sacrifices, and is still hidden unto the natural man. Wherefore the apostle was desirous of making it manifest in a ministerial way; for God only, by his Spirit, makes it manifest in a spiritual, experimental, and saving way.
As, says he,
I ought to speak. The Arabic version adds, "concerning it", the Gospel, the mystery of Christ. The apostle's meaning is, that he might deliver it with that clearness and evidence, and use that plainness of speech which became the Gospel, and him as a minister of it, and not ambiguous expressions, equivocal phrases, words of double meanings, on purpose to hide things from men, but by manifestation of the truth, to commend himself to every man's conscience in the sight of God. As also to speak it faithfully, declaring the whole counsel of God, keeping back nothing that might be profitable to the churches; and with all constancy and certainty, with all boldness and intrepidity of soul, and freedom of mind; not seeking to please men, aiming at vain glory, and popular applause, or being afraid of their faces, menaces, and reproaches.

ALFORD thinks that Paul asks their prayers for his release as if it were the "only" way by which he could "make it (the Gospel) manifest" as he ought. But while this is included in their subject of prayer, Philippians 1:12-13, written somewhat later in his imprisonment, clearly shows that "a door for the word" could be opened, and was opened, for its manifestation, even while he remained imprisoned (compare 2-Timothy 2:9).