The word God-breathed, occurring only here indicates that “all scripture” owes its origin and contents to the divine breath, the Spirit of God. The human authors were powerfully guided and directed by the Holy Spirit. As a result, what they wrote is not only without error but of supreme value for man. It is all that God wanted it to be. It constitutes the infallible rule of faith and practice for mankind.
The Spirit, however, did not suppress the personality of the human writer, but raised it to a higher level of activity (John 14:26). And because the individuality of the human author was not destroyed, we find in the Bible a wide variety of style and language. Inspiration, in other words, is organic, not mechanical. This also implies that it should never be considered apart from those many activities which served to bring the human author upon the scene of history. By causing him to be born at a certain time and place, bestowing upon him specific endowments, equipping him with a definite kind of education, causing him to undergo predetermined experiences, and bringing back to his mind certain facts and their implications, the Spirit prepared his human consciousness. Next, that same Spirit moved him to write. Finally, during the process of writing, that same Primary Author, in a thoroughly organic connection with all the preceding activity, suggested to the mind of the human author that language (the very words!) and that style, which would be the most appropriate vehicle for the interpretation of the divine ideas for people of every rank and position, age and race. Hence, though every word is truly the word of the human author, it is even more truly the Word of God.
Though the word God-breathed—that is, inspired by God—occurs only here, the idea is found in many other passages (Ex. 20:1; 2 Sam. 23:2; Is. 8:20; Mal. 4:4; Matt. 1:22; Luke 24:44; John 1:23; 5:39; 10:34, 35; 14:26; 16:13; 19:36, 37; 20:9; Acts 1:16; 7:38; 13:34; Rom. 1:2; 3:2; 4:23; 9:17; 15:4; 1 Cor. 2:4–10; 6:16; 9:10; 14:37; Gal. 1:11, 12; 3:8, 16, 22; 4:30; 1 Thess. 1:5; 2:13; Heb. 1:1, 2; 3:7; 9:8; 10:15; 2 Peter 1:21; 3:16; 1 John 4:6; and Rev. 22:19).[1]
[1] Hendriksen, W., & Kistemaker, S. J. (1953–2001). Exposition of the Pastoral Epistles (Vol. 4, pp. 302–303). Grand Rapids: Baker Book House.