The Apostle Paul
1 Corinthians 3:3ESV·traditional attribution

for you are still of the flesh. For while there is jealousy and strife among you, are you not of the flesh and behaving only in a human way?

John Calvin Reformed @genevareformer

3. For ye are as yet carnal So long as the flesh, that is to say, natural corruption, prevails in a man, it has so completely possession of the man’s mind, that the wisdom of God finds no admittance. Hence, if we would make proficiency in the Lord’s school, we must first of all renounce our own judgment and our own will.

Matthew Henry Presbyterian @wholebiblehenry

Here, I. Paul blames the Corinthians for their weakness and nonproficiency. Those who are sanctified are so only in part: there is still room for growth and increase both in grace and knowledge, Pe2 3:18. Those who through divine grace are renewed to a spiritual life may yet in many things be defective.

Commenting on 1 Corinthians 3:1-4

John Gill Reformed Baptist @doctorgill

For ye are yet carnal,.... The Syriac reads it, , "ye are in the flesh": a phrase the apostle elsewhere uses of men in an unregenerate state; but this is not his meaning here, as before explained, but that carnality still prevailed among them, of which he gives proof and evidence: for whereas there is among you envying, and strife, and divisions, are ye not carnal, and walk as men?