3:16. All scripture, inspired of God, is profitable to teach, to reprove, to correct, to instruct in justice:
All scripture, ... Every part of divine scripture is certainly profitable for all these ends. But, if we would have the whole rule of Christian faith and practice, we must not be content with those Scriptures, which Timothy knew from his infancy, that is, with the Old Testament alone: nor yet with the New Testament, without taking along with it the traditions of the apostles, and the interpretation of the church, to which the apostles delivered both the book, and the true meaning of it.
3:17. That the man of God may be perfect, furnished to every good work.
2 Timothy Chapter 4
His charge to Timothy. He tells him of his approaching death and desires him to come to him.
4:1. I charge thee, before God and Jesus Christ, who shall judge the living and the dead, by his coming and his kingdom:
4:2. Preach the word: be instant in season, out of season: reprove, entreat, rebuke in all patience and doctrine.
4:3. For there shall be a time when they will not endure sound doctrine but, according to their own desires, they will heap to themselves teachers having itching ears:
4:4. And will indeed turn away their hearing from the truth, but will be turned unto fables.
4:5. But be thou vigilant, labour in all things, do the work of an evangelist, fulfil thy ministry. Be sober.