a couple of things

Psalm 76:70 He chose his servant David,
  calling him from the sheep pens.
71 He took David from tending the ewes and lambs
  and made him the shepherd of Jacob's descendants—
  God's own people, Israel.
72 He cared for them with a true heart
  and led them with skillful hands.

My Life Application Bible says that David spent years taking care of sheep, which are animals completely dependent on their caretakers. Later, God called David out of tending sheep to tend to Israel.

The thing my LAB draws from this is that we should downplay or dismiss the place, season, or situation we may find ourselves in. Many times it a training ground for what lies ahead.

(Will some of you remind me of this often?!)

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Matthew 28:16 Then the eleven disciples left for Galilee, going to the mountain where Jesus had told them to go. 17 When they saw him, they worshiped him—but some of them doubted!

(dan note: I've always found this astounding - that after see the risen Jesus, eating with Him, touching Him, some of the disciples still believe He was who He said He was. Amazing!)

  18 Jesus came and told his disciples, "I have been given all authority in heaven and on earth. 19 Therefore, go and make disciples of all the nations, baptizing them in the name of the Father and the Son and the Holy Spirit. 20 Teach these new disciples to obey all the commands I have given you. And be sure of this: I am with you always, even to the end of the age."

The operative word in this is "go"

Do you notice it isn't location specific?

That could mean go to your work place, neighborhood, family, city, friends, Facebook, or whatever, wherever, whenever, whoever, however.

It's a call to action - to go to the people around you. God will lead us to whatever portion of "all nations" He wants us to take the simple news that He makes all things new.