Prayer is the center of the Christian life. It is the only necessary thing. It is living with God in the here and now.
a spiritual life without prayer is like the gospel without Christ.
[Praying] demands that you take to the road again and again, leaving your house and looking forward to a new land for yourself and your [fellow human]. This is why praying demands poverty, that is, the readiness to live a life in which you have nothing to lose so that you always begin afresh.