The saint needs to take note from the text, that his "boldness" is in Christ, and not in himself. Christ is the saint's true object of faith, and as his faith in Christ grows, so does his boldness toward the denunciation of evil grow. We read of Christ's disciples at the time of His arrest in Gethsemane, "They all forsook Him, and fled," ( Mark 14:50 ). After the resurrection of Christ the faith of the disciples soared to new heights. They were delivered from their base fears, and stood undaunted before the High Priest, Elders and Rulers of Israel, declaring boldly, "Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved." ( Acts 4:12 ) In the next verse we are given one of the conclusions of this Jewish high court, "Now when they saw the boldness of Peter and John, and perceived that they were unlearned and ignorant men, they marvelled; and they took knowledge of them, that they had been with Jesus," ( Acts 4:13 ). Some may see in these words an admission of Christ's resurrection by the Jews, but whether or not this is the case, the poor struggling saint knows that time spent with his risen Lord works wonders for his faltering faith."In Whom we have boldness and access with confidence by the faith of Him." (Ephesians. 3:12)
(Sovereign Grace Advocate - February, 1978)