Now I want you to know, brothers, that what has happened to me has actually resulted in the advance of the gospel, so that it has become known throughout the whole imperial guard, and to everyone else, that my imprisonment is in the cause of Christ. Most of the brothers in the Lord have gained confidence and dare even more to speak the message fearlessly. To be sure, some preach Christ out of envy and strife, but others out of good will. These do so out of love, knowing that I am appointed for the defense of the gospel; the others proclaim Christ out of rivalry, not sincerely, seeking to cause me anxiety in my imprisonment. What does it matter? Just that in every way, whether out of false motives or true, Christ is proclaimed. And in this I rejoice. (Phi 1:12-18)
Take the sword of the Spirit, which is God's word. (Eph 6:17)
For the word of God is living and effective and sharper than any double-edged sword, penetrating as far as the separation of soul and spirit, joints and marrow. It is able to judge the ideas and thoughts of the heart. (Heb 4:12)
For I am not ashamed of the gospel, because it is God's power for salvation to everyone who believes, first to the Jew, and also to the Greek. For in it God's righteousness is revealed from faith to faith, just as it is written: The righteous will live by faith. (Rom 1:16-17)
It seems that person speaking is insignificant compared to the content of the speech. If the word of God is spoken it will work, for it holds the power of the Spirit. Ordination is not so much an issue when one remembers that the word has the power far more than the preacher.