God calls us, but we must be willing to respond. There is no forced action, however, in denying what God has for us we can never truly in this life be fulfilled and satisfied, because we are denying the calling that we were meant for.
I've seen the world equate this calling to a "destiny", and while having a destiny is true that doesn't always mean that it is a selfish destiny. We are called by God, but only after we are willing to open the door (no forced action), to partake in the plan and direction that He has set forth in days long past. When the Bible talks about how He knew us while we are still in our mother's womb that is the destiny that He is placed within us to seek, and to find our fulfillment in His destiny.
For you formed my inward parts; you knitted me together in my mother's womb. I praise you, for I am fearfully and wonderfully made. Wonderful are your works; my soul knows it very well. My frame was not hidden from you, when I was being made in secret, intricately woven in the depths of the earth. Your eyes saw my unformed substance; in your book were written, every one of them, the days that were formed for me, when as yet there was none of them. How precious to me are your thoughts, O God! How vast is the sum of them! If I would count them, they are more than the sand. I awake, and I am still with you. (Psalm 139: 13-18)
We get lost in the idea of how will my life be fulfilled, but what have we said about the One who created us. Even in my own job I find myself unfulfilled and despondent most days about where I am, but I have found it extremely hard to see the life and work that I have in His plan. There are so many moments and experiences that would have been lost to me in recent months if I had simply left when I wanted to. The hardest moments we will have is when we are trying to do things apart from God, rather than with Him.
I re-tweeted, and responded a post on Twitter the other day that talked about a dirty window. (Thanks @sarajaneloves for that insightful post) While the window may look dirty, it can still let in an amazing amount of light given the right circumstances. We are the dirty window, but is it God shining through, or is it us. Have you allowed God to use your circumstances to shine His light? The changing light doesn't come from us alone, because we are merely the vessels that are here to be used by Him to shine His light into a dirty, and twisted world. Let your family, friends, co-workers, and colleagues see the light of Jesus tomorrow, and the next, and so on.
Do you know the calling He has for you? Are you utilizing the light He has shined upon you?