The Most High and Christ can use anyone to speak that is obedient, holy, righteous and yielded to him.

1 Corinthians 2:7  But we speak the wisdom of God in a mystery, even the hidden wisdom, which God ordained before the world unto our glory: 

1 Corinthians 2:8  Which none of the princes of this world knew: for had they known it, they would not have crucified the Lord of glory. 

1 Corinthians 2:9  But as it is written, Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which God hath prepared for them that love him. 
1 Corinthians 2:10  But God hath revealed them unto us by his Spirit: for the Spirit searcheth all things, yea, the deep things of God. 

1 Corinthians 2:11  For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God.