Prayer is co-operation with God. It is the purest exercise of the faculties God has given us—an exercise that links these faculties with the Maker to work out the intentions He had in mind in their creation. Prayer is aligning ourselves with the purposes of God…

Prayer is commitment. We don’t merely co-operate with God with certain things held back within… We, the total person, co-operate. This means that co-operation equals commitment. Prayer means that the total you is praying… Your whole being reaches out to God, and God … reaches down to you…

Prayer is communion. Prayer is a means, but often it is an end in itself… There are times when your own wants and the needs of others drop away and you want just to look on His face and tell Him how much you love Him…

Prayer is commission. Out of the quietness with God, power is generated that turns the spiritual machinery of the world. When you pray, you begin to feel the sense of being sent, that the divine compulsion is upon you.

… E. Stanley Jones in Growing Spiritually. Via CQOTD