The Apostle in I Corinthians 3.1 divides all Christians into two classifications.
They are the spiritual and the carnal.
A spiritual Christian is one in whom the Holy Spirit dwells in his spirit and controls his entire being.
What is meant, then, by being carnal? The Bible employs the word “flesh” to describe the life and value of an unregenerated man. It comprises everything which issues from his sinful soul and body (Rom. 7.19).
‘Hence a carnal Christian is one who has been born anew and has God’s life, but instead of overcoming his flesh he is overcome by the flesh. We know the spirit of a fallen man is dead and that he is dominated by his soul and body. A carnal Christian, therefore, is one whose spirit has been quickened, but who still follows his soul and body unto sin.
If a Christian remains in a carnal condition long after experiencing new birth, he hinders God’s salvation from realizing its full potential and manifestation. Only when he is growing in grace, constantly governed by the spirit, can salvation be wrought in him. God has provided full salvation in Calvary for the regeneration of sinners and complete victory over the believer’s old creation.