D&C 36

2 And I will lay my hand upon you by the hand of my servant Sidney Rigdon, and you shall receive my Spirit, the Holy Ghost, even the Comforter, which shall teach you the peaceable things of the kingdom;
3 And you shall declare it with a loud voice, saying: Hosanna, blessed be the name of the most high God.
4 And now this calling and commandment give I unto you concerning all men—
5 That as many as shall come before my servants Sidney Rigdon and Joseph Smith, Jun., embracing this calling and commandment, shall be ordained and sent forth to preach the everlasting gospel among the nations—

I thought this was neat because look how important the Holy Ghost is. When you have it, and know it, it's not that big of a thing. It's great, an I love it. But it's one of those things you notice more when it's gone. I'm going to try and remember what a blessing it really is.

Also, the last line I think applies to everyone. Not to the same degree, some people will never go on a full time mission. Some people will only do it in their families, others to their neighbors or friends. But it is important and faith building to get the message out. It's also hard and really scary.