Living is definitely active.

What have you made of your life so far?
Would you enjoy reading your biography or would it just seem like a tangle of loose ends and knots?
Do you sometimes find it too unbelievable to think that God would want to include you in His plans? Do you think that God couldn’t possibly use you because of your weak faith?

When you and I were saved we became a part of ‘the body of Christ’ (this is the church as a whole). Now, sit still a moment; don’t move a muscle. Are you inactive? No, you can never be truly inactive [not until you’re dead, at least!]. Even when you think that you are sitting still your body is incredibly active keeping you alive!
Similarly you have not been called to be an inactive part of Christ’s body – no one is called to be an inactive part of Christ’s body! You may have a grand function that everyone will applaud (like hands that play the piano or pick people up and care for them) or your activity may be unseen and secret but essential (like the heart pumping blood or the kidney purifying the blood).

“Just as our bodies have many parts and each part has a special function, so it is with Christ's body. We are all parts of his one body, and each of us has different work to do. And since we are all one body in Christ, we belong to each other, and each of us needs all the others.
God has given each of us the ability to do certain things well. So if God has given you the ability to prophesy, speak out when you have faith that God is speaking through you. If your gift is that of serving others, serve them well. If you are a teacher, do a good job of teaching. If your gift is to encourage others, do it! If you have money, share it generously. If God has given you leadership ability, take the responsibility seriously. And if you have a gift for showing kindness to others, do it gladly.” Rom 12:4-8 (NLT)

Whether we are ‘hands’ or ‘hearts’, we have an essentially active role within the church. If we become inactive (and we become inactive because we are not born [again] that way – we were not still born into the church) the body of Christ becomes disabled; you may think that no-one will notice but in the end it will cause a strain to other parts.
One of my eyes is weaker than the other (the stronger one does not know this of course – they don’t get to see each other after all). As a result if I am reading for a long period of time my stronger eye begins to ache because it is unknowingly forced to work harder, compensating for my ‘inactive’ eye.

I know that I am often guilty of thinking that my decision to do nothing in response to God’s call will pass un-noticed, but that is never the case. And so how can we prevent ourselves ceasing up and becoming inactive? The secret is in the beginning few verses of Romans 12:

“So here's what I want you to do, God helping you: Take your everyday, ordinary life—your sleeping, eating, going-to-work, and walking-around life—and place it before God as an offering. Embracing what God does for you is the best thing you can do for him. Don't become so well-adjusted to your culture that you fit into it without even thinking. Instead, fix your attention on God. You'll be changed from the inside out. Readily recognize what he wants from you, and quickly respond to it. Unlike the culture around you, always dragging you down to its level of immaturity, God brings the best out of you, develops well-formed maturity in you.” Rom 12:1-2 (Msg)