The biblical concept of a spiritual Christian is one who is governed by the Holy Spirit rather than by his lower nature. “He that is spiritual” is contrasted with “the natural man,” that is, the soulish (lit.) or unregenerate individual, in 1 Cor. 2:14-16. The spiritual person is also set over against the carnal or fleshly believer who is still a babe in Christ, 1 Cor. 3:1-4.
Christians are exhorted to grow by feeding on the Word, 1 Pet. 2:2. The Holy Spirit teaches them by means of the Scriptures, John 16:13. They are led by the Spirit, Rom. 8:14; walk in the Spirit, Gal. 5:16; bear spiritual fruit, Gal. 5:22, 23; are strengthened by the Spirit, Eph. 3:16; and are filled with the Spirit, Eph. 5:18.
Spiritual Christians enjoy life and peace, Rom. 8:6. They acknowledge the epistles of Paul to be the commandments of the Lord, 1 Cor. 14:37. Far from thinking themselves to be on a higher spiritual plane than others, they seek to restore fallen believers in a spirit of meekness, lest they themselves face the same problem, Gal. 6:1-3.
Eph. 5:18-21 may be considered to be a description of a spiritual person, filled with joy and walking in humility, Jas. 4:6. Spiritual understanding, Col. 1:9, enables the believer to impart spiritual gifts to others, Rom. 1:11.
William Evans, The Great Doctrines of the Bible, (Chicago: Bible Institute Colportage Assoc., 1912), WORDsearch CROSS e-book, Under: “Spirituality”.