Opening act vs. stepping aside

In today's sermon, Pastor Randy spoke of how we are in effect the opening act for the coming of the Kingdom of God. It is our job as Christians, to help all the children of God to get ready for God. I am good with this - I am an action oriented kind of person, so I am good with going out and paving the way! As I sit in my office, and think of new things to do to get ready for Jesus (yes, I know I am a Martha to the core), a prayer I have posted to my monitor caught my eye.

I am no longer my own, O God, but yours.
Put me to what you will; place me among who you will,
Put me to serving; Put me to suffering.
Employ me for your sake, or set me aside for your sake.
Set me in high places or bring me to the depths.
Let me be filled, or let me be emptied.
Let me have all things, or let me have nothing.
I freely and with all my heart hand over to you my life, to do with as you please. Now, glorious and blessed God, Father, Son, and Holy Spirit, you are mine and I am yours.
So be it.

I love this prayer, because overall it speaks of all things we can do, or have or experience for Jesus. I struggle with the simple phrase: or set me aside for your sake. Set me aside? But then what would I do? Who would I be if I wasn't doing something? How could I serve God by being set aside? Am I still of value to God, if I'm not doing something for God?