The following is by Thomas Merton, from his book Love and Living. Wow, this is a good one to spend some serious time with.

All Christian life is meant to be at the same time profoundly contemplative and rich in active work. ...It is true that we are called to create a better world. But we first of all are called to a more immediate and more exalted task: that of creating our own lives. In doing this, we act as co-workers with God. We take our place in the great work of mankind, since in effect the creation of our own destiny, in God, is impossible in pure isolation. Each one of us work out his own destiny in inseparable union with all those others with whom God has willed us to live. We share with one another the creative work of living in the world. And it is through our struggle with material reality, with nature, that we help one another create at the same time our own destiny and a new world for our descendants. This work of man, which is his peculiar and inescapable vocation, is a prolongation of the creative work of God Himself. Failure to measure up to this challenge and to meet this creative responsibility is to fail in that response to life which is required of us by the will of our Father and Creator.