Are My Prayers In The Spirit Or From the Natural Mind?

It is not always safe for a man to conclude that he is influenced by the Spirit of God, when he finds a fluency of words and freedom of utterance. For this frequently proceeds from natural causes, such as a happy position of the animal spirits — or from familiarity with the persons with whom we pray, especially if we're conscious that their gifts are inferior to our own. Yes, if we only imagine it so, it answers the same end.