I would like to add that the Apostle is one of the five spiritual offices Jesus created. Ephesians 4:10-12(NIV): "He who descended is the very one who ascended higher than all the heavens, in order to fill the whole universe.) 11It was he who gave some to be apostles, some to be prophets, some to be evangelists, and some to be pastors and teachers, 12to prepare God's people for works of service, so that the body of Christ may be built up." (my emphasis)
1 Corinthians 12:28 teaches us the importance of the Apostle:
"And in the church God has appointed first of all apostles, second prophets, third teachers, then workers of miracles, also those having gifts of healing, those able to help others, those with gifts of administration, and those speaking in different kinds of tongues."
Since the Apostle is first, God gives him or her the overall plan or "big picture." It's a picture that no one else in the church or ministry receives. Prophets, Evangelists, Pastors, and Teachers will each receive a picture that fits into the Apostle's picture. When they all work together, there is unity.
It's easy to recognize an Apostle, as they are the people who are planting churches and starting ministries. Some Senior Pastors are Apostles - you will find them in churches that are planting other churches, as Apostles have a special anointing from God to plant new works of the Lord.
Pastor Rod Nichols
Truth and Grace Foursquare Church
University Place, WA
Author, God's Prosperity Plan