an ability to teach

"An ability to teach isn't oratory: the ability to make a rhetorical flourish, or to hold a crowd. there are plenty of people who can do all those things, who actually fail to teach effectively. It's the more fundamental ability to bring the truths of God's word to bear with relevance into people's lives. And the truth is that this happens more often in a conversation than in a pulpit."
Steve Timmis, Gospel Centred Leadership