Prayer is more than meditation. In meditation the source of strength is one's self. When one prays he goes to a source of strength greater than his own.
The relationship to one's fellow man is the relationship of prayer, the relationship to oneself is the relationship of striving; it is from prayer that one draws the strength for one's striving.
Action is the normal completion of the act of will which begins as prayer. That action is not always external, but it is always some kind of effective energy.