3:16 {5} All scripture [is] given by inspiration of God, and [is] profitable for doctrine, for reproof, for correction, for instruction in righteousness:
(5) The eighth admonition which is most precious: a pastor must be wise by the word of God alone: in which we have perfectly delivered to us, whatever pertains to discerning, knowing and establishing true opinions, and to prove which opinions are false: and furthermore, to correct evil manners, and to establish good.
3:16 All scripture [is] given by inspiration of God. The Revised Version is much better: Every Scripture inspired of God is also profitable, etc. Whether it is depends on its inspiration. For instance, the Apocrypha is called Scripture, but is not inspired.
For doctrine. For teaching.
3:16 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.
3:14-17 Those who would learn the things of God, and be assured of them, must know the Holy Scriptures, for they are the Divine revelation. The age of children is the age to learn; and those who would get true learning, must get it out of the Scriptures. They must not lie by us neglected, seldom or never looked into. The Bible is a sure guide to eternal life. The prophets and apostles did not speak from themselves, but delivered what they received of God, 2Pe 1:21. It is profitable for all purposes of the Christian life. It is of use to all, for all need to be taught, corrected, and reproved. There is something in the Scriptures suitable for every case. Oh that we may love our Bibles more, and keep closer to them! then shall we find benefit, and at last gain the happiness therein promised by faith in our Lord Jesus Christ, who is the main subject of both Testaments. We best oppose error by promoting a solid knowledge of the word of truth; and the greatest kindness we can do to children, is to make them early to know the Bible.