Verse 16. All scripture is inspired of God - The Spirit of God not only once inspired those who wrote it, but continually inspires, supernaturally assists, those that read it with earnest prayer. Hence it is so profitable for doctrine, for instruction of the ignorant, for the reproof or conviction of them that are in error or sin, for the correction or amendment of whatever is amiss, and for instructing or training up the children of God in all righteousness.
Verse 17. That the man of God - He that is united to and approved of God. May be perfect - Blameless himself, and throughly furnished - By the scripture, either to teach, reprove, correct, or train up others.