Prayer in the power of the flesh relies upon human ability and effort to carry the prayer forward. We all know what it is to feel deadness in prayer, difficulty in prayer, to be tongue-tied, with nothing to say, as it were, having to force ourselves to try. Well, to the extent that is true of us, we are not praying in the Spirit. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.