Great post over at SBCVoices by my friend, Dwight McKissic. Dwight addresses what it means to "pray in the Spirit" as we see in Ephesians 6:18, Jude 20, and 1 Corinthians 14. All Christians are commanded to "pray in the Spirit," which basically means that we are to pray according to the impulse and guidance of the Holy Spirit. We are to pray with the power and intimacy of the Spirit. And, we are to pray deeply and passionately along the lines that the Spirit guides. It is the Spirit of God that knows the deep things of God and reveals them to us (1 Cor. 2:10-13). We are to be led by the Spirit as we pray and not just pray whatever we think or whatever pops into our mind - unless we are offering those things too to The Lord and laying all of our desires at His feet for Him to deal with as He desires.
I am a big proponent of praying EVERYTHING to God, even things that are wrong. When we give Him our wrong and selfish desires in prayer, then He will transform them into Godly desires and shape our hearts around His purposes. Even this is a form of praying in the Spirit because we are praying in accordance with the Spirit and in line with the will and character of God.
Dwight's post is an excellent reminder that we are to be praying in the Spirit at all times.