How to identify an evangelist? He gets stuck in a crowded elevator and later, when the door opens, some have come to Jesus Christ and the rest are convicted of their sins.
How to identify a prophet? Same situation. Some are thrilled at what the Lord has revealed about them, and others are scared that God can see into their hearts.
How to identify an apostle? Some have been allotted activities, and the others have offered to help them.
A pastor? Everyone leaving the elevator has been prayed for and feels like he or she really belongs.
A teacher? The meaning of life is now clear, and all are aware that God foreknew where and when they would be stuck in the elevator. And, they all have a new and strange desire to actually read the Bible.