Thus, discipline is the creation of boundaries that keep time and space open for God. Solitude requires discipline, worship requires discipline, caring for others requires discipline. They all ask us to set apart a time and a place where God's gracious presence can be acknowledged and responded to.
For further reflection...
While I was still in prayer, Gabriel, the man I had seen in the earlier vision, came to me in swift flight... He instructed me and said to me, "Daniel, I have now come to give you insight and understanding. As soon as you began to pray, an answer was given, which I have come to tell you, for you are highly esteemed. Therefore consider the message and understand the vision." - Daniel 9: 21-23 (NIV)
This devotional was written by Henri Nouwen.
You can find his website here: henrinouwen.org