What Is Spirituality? What Does It Mean to Be 'Spiritual'?
Summary:True, biblical spirituality has nothing to do with spookiness or weird behavior. It is certainly not "the parnamormal." The Bible clearly describes what it means to be spiritual in the wholesome, uplifting sense made possible only by God Almighty.
• Natural illustration: “The Spirit of the Lord came upon [Samson] in power so that he tore the lion apart with his bare hands” (Judges 14:6).
1 Corinthians 1:7-8 Therefore you do not lack any spiritual GIFT as you eagerly wait for our Lord Jesus Christ to be revealed.  He will keep you strong TO THE END, so that you will be blameless on the day of our Lord Jesus Christ.
•• Spiritually gifted and strong“to the END” =
(1) certainly throughout your life (“never leave you”);
(2) The church gifted and strong “to the end ... [that is] the day [the COMING] of our Lord Jesus Christ.”
• This verse should be prayerfully considered by those who teach that the gifts of the Holy Spirit have ceased. They have tragically caused their listeners to lack spiritual gifts in this time leading up to "...the end ... the day of our Lord Jesus Christ."
1 Corinthians 3:1-2 Brothers, I could not address you as SPIRITUAL but as WORLDLY — mere infants in Christ.  I gave you milk, not solid food, for you were not yet ready for it. Indeed, you are still not ready.
•• To be spiritual is to be the opposite of being WORLDLY ... CARNAL (KJV).
•• My pastor once preached an excellent sermon entitled “How to Be Carnal: Just Don’t Be Spiritual”
•• We all have two choices: Walk in the Spirit, or walk in the flesh. We must choose either to be carnal or to be spiritual. Spiritual growth and maturity come to the "SPIRITual" man or woman.
Romans 12:1-2 Therefore, I urge you, brothers, in view of God’s mercy, to offer your bodies as living sacrifices, holy and pleasing to God — this is your SPIRITUAL act of worship.  DO NOT CONFORM any longer to the pattern of THIS WORLD...
•• Three characteristics of the spiritual man or woman:
(1) Lives life as a living sacrifice, not self-centeredly
(2) Lives a holy life
(3) Looks to live in such a way as to please God
•• To be deemed “spiritual” by God, “do NOT CONFORM ... to the pattern of this WORLD.”
• As in the previous verse, the opposite extremes are to be “spiritual” or to be “worldly...carnal.” Biblical spirituality is the exact opposite of worldly carnality.
Romans 12:11 Never be lacking in ZEAL, but keep your spiritual FERVOR, serving the Lord.
•• The spiritual person is NOT LAZY, doesn’t take the things of God for granted.
•• Rather, he/she is zealous and fervent for the Lord. Spiritual formation and growth remain high priorities.
•• The spiritual person “keeps his lamp burning.”
1 Corinthians 2:12-14 We have not received the spirit of the world but the Spirit who is from God, that we may UNDERSTAND what God has freely given us.  This is what we speak, not in words taught us by human wisdom but in words taught by the Spirit, expressing SPIRITUAL TRUTHS in SPIRITUAL WORDS.  The man without the Spirit does not accept the things that come from the Spirit of God, for they are foolishness to him, and he cannot understand them, because they are SPIRITUALLY DISCERNED.
•• “We have ... received the Spirit ... that we may UNDERSTAND ... the things of God.”
Galatians 6:1 Brothers, if someone is caught in a SIN, you who are spiritual should restore him gently. But WATCH YOURSELF, or you also may be TEMPTED.
•• Spiritual people look not to judge, but to restore.
•• A mark of biblical spirituality is taking a realistic and watchful approach to our ever-present temptations.
Ephesians 6:12 For our STRUGGLE is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the SPIRITUAL FORCES OF EVIL in the heavenly realms.
•• The Scriptures teach that we humans are body, soul, and spirit (1 Thessalonians 5:23). Our body, our intellect, our emotions are just part of our total being. There is also a spirit realm — for example, our human spirits, the Holy Spirit, angels, demons, and a real devil known as Satan. Spiritual people recognize the reality of the SPIRITUAL WARFARE we are in. Biblical spirituality makes us more aware of the devil and his relentless opposition to us.
I trust that the Scriptures we've looked at have helped you press forward into true, biblical spirituality. There is much out there — the paranormal, New Age spirituality, yoga with its Eastern religious influences, and much more — claiming to be enlightened and "spiritual." But sadly, spirituality sought other than in God the Father, Jesus His son, the Holy Spirit, and God's Word the Bible will only lead into the horribly dark side of the spirit realm inhabited and controlled by the devil and his demons.