"Although the discipline of solitude asks us to set aside time and space, what finally matters is that our hearts become like quiet cells where God can dwell, wherever we go and whatever we do. The more we train ourselves to spend time with God and God alone, the more we will discover that God is with us at all times and in all places. Then we will be able to recognize God even in the midst of a busy and active life. Once the solitude of time and space has become a solitude of the heart, we will never have to leave that solitude. We will be able to live the spiritual life in any place and any time. Thus the discipline of solitude enables us to live active lives in the world, while remaining always in the presence of the living God."
From Making All Things New
quoted in The Only Necessary Thing: Living a Prayerful LifeCrossroad Classic, 1999