New Defender's Study Bible Notes
14:37 spiritual. “Spiritual” here is the same word (pneumaticos) as “spiritual gifts” (I Corinthians 14:1). Thus Paul is claiming that any man who truly possessed one of the spiritual gifts (especially, perhaps, that of discernment) would have to recognize the divine inspiration of his own writings. This is a very clear and emphatic affirmation by Paul himself of the inerrant verbal inspiration of his epistles.