I say lots of things for the benefit of the one I'm talking to, or even for the benefit of others, knowing the one I'm talking to isn't listening. BUT that doesn't make me a teacher.
I ain't a teacher!
What makes teachers?
I ain't a teacher!
What makes teachers?
There is a logical spiritual progression in these spiritual gifts as seen in the order presented by Paul.
Apostles & prophets -- foundational -- found in the 66 books of the Bible.
Evangelists -- to preach the true Gospel -- the Word of God (for today)
Pastors -- to feed those who are saved with the Word of God (for today)
Teachers -- to teach Christians so that they mature in Christ (for today)
So a teacher is one who is gifted and called to teach God's truths to the saints. At the same time, teachers must be diligent students of the Word of God, and know how to rightly divide (interpret) the Word of Truth. They are not necessarily products of any seminary or Bible school, since the Holy Spirit is their Divine Teacher. So for churches to require an M. Div. before a man can minister to them indicates how confused things have become.
Ideally all those spiritual gifts must be manifested in the local church, and those who have been gifted and called to teach will be acknowledged by the church and appointed as elders. One of the qualifications of an elder is "apt to teach" and those who "labor in the Word and doctrine" are to be compensated accordingly. Furthermore, elders are to also teach other faithful men, so that the next generation of elders are sound in the faith. This is the Bible "ideal", not necessarily what actually happens.
Since most evangelical and fundamentalist churches do not follow the Scriptural pattern laid down in the New Testament, we do not see the spiritual gifts being encouraged and exercised as they ought to be. Also too many believers are either content to remain babes in Christ, or are discouraged from maturing to the point that they should be handling "strong meat" (advanced Bible truth) rather than "milk" (the basics of Christianity). For example, we see in these multiple and endless threads in Christian forums about faith and works that there is a problem. That something this fundamental is still a bone of contention shows that somewhere along the way there was no sound teaching.