All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
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2 Timothy 3:14-17
Tyndale Open Study Notes (CC BY-SA 4.0).
3:16-17 These verses elaborate on 3:15 by explaining Scripture’s effectiveness, its source, and the ways that it gives wisdom to live out our salvation. Paul was speaking of the Hebrew Scriptures (the Old Testament), but his statement can now apply to all Scripture, including the New Testament (see, e.g., 2 Pet 3:15-16).
3:16 The fact that Scripture is inspired by God (literally God-breathed, breathed out by God’s own speech; see also Heb 4:12-13; 2 Pet 1:20-21) does not negate the active involvement of the human authors. But it does affirm that God is fully responsible for his word. Scripture is true, reliable, authoritative, permanent, and powerful because it comes from God himself.
Other Bible passages linked to this one, most cited first.
For whatsoever things were written aforetime were written for our learning, that we through patience and comfort of the scriptures might have hope.
For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: Knowing this first, that no prophecy of the scripture is of any private interpretation. For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
And Jesus answering said unto them, Do ye not therefore err, because ye know not the scriptures, neither the power of God?
The law of the LORD is perfect, converting the soul: the testimony of the LORD is sure, making wise the simple. The statutes of the LORD are right, rejoicing the heart: the commandment of the LORD is pure, enlightening the eyes. The fear of the LORD is clean, enduring for ever: the judgments of the LORD are true and righteous altogether.
For the commandment is a lamp; and the law is light; and reproofs of instruction are the way of life:
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.