16 All scripture is inspired by God and profitable for teaching, for reproof, for correction, and for training in righteousness, 17 that the man of God may be complete, equipped for every good work. (2 Tm 3:16-17, RSV)
If I remember my studies correctly, there are three significant words that most protestants use to prooftext sola scriptura in 2 Tm 3:16-17, those being:
“profitable”: Bauer’s lexicon defines it as: “useful, beneficial, advantageous, what is particularly helpful” (p. 900). This form appears in two other places in the New Testament, e.g., “for physical training is of some value” (1Tm 4:8) and “these things are excellent and profitable for everyone” (Titus 3:8). The verbal form oopheleoo appears 16 times, denoting the concept of “profitability” or “value,” e.g., Rm 2:25; 1Co 13:3; Gl 5:2; Hb 4:2. The noun form oopheleia appears twice, once translated as “advantage” in Jude 16. All in all, oophelimos does not mean selfsufficient. If Paul wanted to teach sufficiency he could have used a word such as autarkeia (2Co 9:8; 1Tm 6:6), which is lexically defined as “the state of one who supports himself without aid from others; contentment, selfsufficiency” (Bauer, op. cit., p. 122). A similar word is hikanos which can sometimes be translated as “sufficient” (2Co 2:6, 16; 3:5) or “qualified” or “able” (2Tm 2:2); and arkeoo which means “sufficient” or “content” (cf., John 14:8; 2Co 12:9; 1Tm 6:8), but none of them are used to describe Scripture.
Also:
“complete”: pronounced: artios from the verb artidzo.
“equipped”: pronounced: exartismenos from the verb exartidzo, which is a combination of ex + artidzo)
Greek lexicons are somewhat varied in their definition of both artios (RSV “complete”) and exartismenos (RSV “equipped”).
Standard lexical works such as Walter Bauer, Liddell and Scott, Ardt and Gingrich, and Louw and Nida contain a range of meanings from “fit” and “capable” to “complete” or “perfect.”
Liddell and Scott define artios as: (1) “complete, perfect of its kind, exactly fitted” (2) “active, quick, ready.” It defines exartidzo as “to complete, finish, to be completely furnished” (Abridged version, Oxford, Clarendon Press, 1977) pp. 105, 233.
Walter Bauer defines artios as “complete, capable, proficient=able to meet all demands.” He defines exartidzo as: (1) “finish, complete” and (2) “equip, furnish.” (2nd edition, revised by Gingrich and Danker, University of Chicago Press, Chicago and London, 1957, 1979), pp. 110, 273.
The definitions of “fit,” “capable,” or “ready” show a preparedness to accomplish a given task but do not guarantee the outcome. The definitions of “complete” and “perfect” speak more to the expected result. Suffice it to say that, coupled with the very infrequent usage of these words in both classical and Koine Greek, the variations in meaning suggests that the understanding and application of the words will depend heavily upon the context in which they are placed.
The New Testament uses artios only here in 2 Timothy 3:17, while it uses exartidzo (from which exartismenos is derived) twice, the other occurrence appearing in Acts 21:5 in the infinitive form, normally translated as “accomplished” or “ended” (“But when those days were ended, we departed and went our way…”).
In the Septuagint exartidzo appears only in Exodus 28:7, translated as “fastened,” while artios appears only once, as a temporal adverb in 2 Samuel 15:34, translated as “until now.” Artios andits derivatives come from the root ar, which means “appropriateness, suitability, usefulness, aptitude.” The cognate katartidzo, its oldest derivative in classical Greek, means “to put in order, restore, furnish, prepare, equip.” These various meanings have a common origin in the basic concept “to make suitable, fitting.”
The Septuagint uses katartidzo 19 times, standing for no less than 9 different Hebrew words, e.g., in the sense of “complete” (Ezra 4:12), “to set up, establish” (Psalm 74:16), “to hold fast” (Psalm 17:5), “God’s equipping” (Psalm 40:6), “to restore” (Psalm 68:9). Katartidzo is also used in the New Testament as “repair” (Matthew 4:21), “prepare” (Hebrews 10:5), “to establish,” “to form” (Hebrews 11:3), “to equip” (1 Peter 5:10). From these various meanings and contexts, we understand Paul to teach that Scripture prepares the man of God to function properly — his function being to do “every good work.”
Commenting on these varied meanings, the Dictionary of New Testament Theology states: “artios here does not imply perfection, as was originally thought, doubtless because of the variant reading teleios, (“perfect”), in Codex D. Rather it refers to the state of being equipped for a delegated task. So too, in Eph. 4:12* katartismos* refers to the preparation of the church for becoming perfect, but not to this perfection itself, as can be seen from the use of teleios (complete, mature > Goal), helikia (stature > Age, Stature), and pleroma (> fulness) in v. 13 (Also 1 Cor. 1:10). The terms artios and katartismos thus have not so much a qualitative meaning as a functional one” (p. 350).
If you look at the Scriptures in its entirety, it is unlikely that anyone could teach a fallacy such as sola scriptura and remain honest with themselves and God.
15 So then, brethren, stand firm and hold to the traditions which you were taught by us, either by word of mouth or by letter. (2 Thess. 2:15, RSV)