John Owen on prayer:
When prayer is a delight to believers, refreshing their spirits, calming their minds and comforting their consciences, then it is true prayer (Psalm 36:7-9). If prayer does not have this effect on us, we need humbly to plead that it should. Moreover, when prayer is accompanied by a longing to behave in holy ways, then we may say that prayer has come from a spiritual mind. Believers who pray rightly will try to live rightly and to avoid anything that would prevent godliness [Thinking Spiritually (London: Grace Publications, 1998), 20].