Declare These Things Part 4: What is an Apostle?

I wasn't going to add to this series but than I came across the following lecture by Joseph Smith. This was related by Zebedee Coltrin in 1883.

At one of these meetings after the organization of the school, (the school being organized_ on the 23rd of January, 1833, when we were all together, Joseph having given instructions, and while engaged in silent prayer, kneeling, with our hands uplifted each one praying in silence, no one whispered above his breath, a personage walked through the room from east to west, and Joseph asked if we saw him. I saw him and suppose the others did and Joseph answered that is Jesus, the Son of God, our elder brother. Afterward Joseph told us to resume our former position in prayer, which we did. Another person came through; he was surrounded as with a flame of fire. He (Brother Coltrin) experienced a sensation that it might destroy the tabernacle as it was of consuming fire of great brightness. The Prophet Joseph said this was the Father of our Lord Jesus Christ. I saw Him. 

When asked about the kind of clothing the Father had on, Brother Coltrin said: I did not discover his clothing for he was surrounded as with a flame of fire, which was so brilliant that I could not discover anything else but his person. I saw his hands, his legs, his feet, his eyes, nose, mouth, head and body in the shape and form of a perfect man. He sat in a chair as a man would sit in a chair, but this appearance was so grand and overwhelming that it seemed I should melt down in his presence, and the sensation was so powerful that it thrilled through my whole system and I felt it in the marrow of my bones. The Prophet Joseph said: Brethren, now you are prepared to be the apostles of Jesus Christ, for you have seen both the Father and the Son and know that they exist and that they are two separate personages. (Minutes, Salt Lake City School of the Prophets, October 3, 1883. BOAP)

An apostle is one who has been in the presence of the Son and the Father. One who is sent by God with a message. In some places they are also called a disciple of Christ.