Mature Christians in every denomination recognize that the ability to teach the Bible is a gift that comes from the Holy Spirit of God, as is plainly stated in Romans and 1 Corinthians. Fewer are able to reel off a list of criteria by which gifted teachers may be easily identified, especially when that gift is in early stages of development.
In practice, some believers instinctively associate gift with charisma, others with seminary training, still others for some intangible quality in a teacher’s ministry that reminds them of Bible teachers who influenced them early in their own Christian lives.