I give them eternal life, and they will never perish, and no one will snatch them out of my hand.  My Father, who has given them to me, is greater than all, and no one is able to snatch them out of the Father’s hand.  I and the Father are one.

John 10:28-30 ESV
http://bible.com/59/jhn.10.28-30.ESV

The ultimate security is knowing the place you are in, is safe. There is freedom in the obedience of Christ. Those who are in relationship with the father have the assurance that the Lord has them and no entity; large or small could physically remove them from the pressence of the Almighty.
This claim by Jesus is backed by the Father. In times like these, this guarantee should give us the motivation to do great exploits for the kingdom. It should free us to be who the Lord has called us to be. I get excited when I get to teach this message to teens; because, it allows them to recognize a constant in the tumultuous chapter of their lives.
As you get the honor of leading ministry, focus on the backing that you have in Christ. Focus on giving those you serve the oppurtunity to share the joy you have.