Philippians 1:12-16 “I want you to know, brothers, that what has happened to me has really served to advance the gospel, so that it has become known throughout the whole imperial guard and to all the rest that my imprisonment is for Christ. And most of the brothers, having become confident in the Lord by my imprisonment, are much more bold to speak the word without fear. Some indeed preach Christ from envy and rivalry, but others from good will. The latter do it out of love, knowing that I am put here for the defense of the gospel. The former proclaim Christ out of selfish ambition, not sincerely but thinking to afflict me in my imprisonment.”
Paul went above and beyond to ensure that he was a witness of the Gospel. Whether it was explicit teaching or preaching, or singing, or debating. Paul spoke the Word as if his life depended on it. Now it is believed that 5% of evangelical Christians have shared their personal story of faith. And I rightly understand why, it is because each one looks to their own when tempted to engage.
Therefore, any evangelistic endeavor effectively requires understanding that there is spiritual warfare in evangelism. Believers should be doing evangelism with the authority of Christ and in complete reliance on the Holy Spirit.