Ephesians 4:11-13 (New International Version)
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 13until we all reach unity in the faith and in the knowledge of the Son of God and become mature, attaining to the whole measure of the fullness of Christ.
1 Corinthians 12:28 (New International Version)
28And 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.
Apostles are men who would complete God's work. They would do what Christ would do if He's on earth. I hope we can all see the importance of apostles tonight. :)