To pray with the Spirit means to pray from a nature inspired and moved by the Holy Spirit. The Holy Spirit imparts new life in us. He quickens our dormant powers. Therefore we pray in newness of Spirit, not in the oldness of the letter.
Prayer often becomes cold and formal.
It degenerates into mere words. Then it is an unprofitable religious exercise. Saying prayers is no more praying than a copse is a living man. No more can a person, who is accustomed only to say prayers with his lips, understand the life and power of prayer that bursts forth from a spiritual heart and mind. Real prayer involves spiritual ardor.