What is the “spirit” referenced in the passage? “Spirit” in the Greek is “pneuma.” Strong’s Concordance defines it broadly: “a current of air, breath, mental disposition or an angel, demon.” Throughout Romans, the Apostle Paul also used “pneuma” in different contexts with a variety of meanings. Some verses in Romans do not refer to God’s holy spirit. For example, Paul wrote, “I serve with my spirit” (1:9), “spirit of bondage” (8:15), “spirit of slumber” (11:8) and “fervent in spirit” (12:11). Spirit in these scriptures would mean a person’s mental disposition or attitude.
Romans 8:16-27 explains that God’s spirit bears testimony with our spirit. When we become Christians, our attitude is to have God’s will done in own lives. This new desire in the heart is the New Creature. (2 Corinthians 5:17) The New Creature is the spirit in this verse. Our inner thoughts and desires are what God can know. Romans 8:27 “He that searches the hearts knows what is the mind of the Spirit