2 Tim 3:16 says: "All Scripture is inspired of God and beneficial for teaching, for reproving, for setting things straight, for disciplining in righteousness." (NWT)
It may be that Paul was referring to the scriptures available then (the OT), but we (and most others who call themselves Christians) now also include what is called the New Testament (NT) under the designation of "inspired scripture."
Therefore, since 2 Tim. 3:16 itself is "inspired scripture," it now should be considered (by Christians, at least) as part of the "all scripture" mentioned above.
Additionally, it may be that the inspired writings of the NT writers (including Paul's writings, of course) were considered inspired scripture even then.
Notice 2 Peter 3:16:
"[Paul,] speaking of this as he does in all his letters. There are some things in them hard to understand, which the ignorant and unstable twist to their own destruction, as they do THE OTHER SCRIPTURES." - NRSV.
The word for "scripture(s)" in the NT is 'graphe.' The inspired writers of the NT always used this word as meaning "inspired scriptures." Here are all the 51 places it is found in the NT:
"Scripture": Mark 12:10; 15:28; Luke 4:21; John 2:22; 7:38; 7:42; 10:35; 13:18; 17:12; 19:24; 19:28; 19:36; 19:37; 20:9; Acts 1:16; 8:32; 8:35; Romans 4:3; 9:17; 10:11; 11:2; Galatians 3:8; 3:22; 4:30; 1 Tim. 5:18; 2 Tim. 3:16; James 2:8; 2:23; 4:5; 1 Peter 2:6; 2 Peter 1:20.
"Scriptures": Matthew 21:42; 22:29; 26:54; 26:56; Mark 12:24; 14:49; Luke 24:27; 24:32; 24:45; John 5:39; Acts 17:2; 17:11; 18:24; 18:28; Romans 1:2; 15:4; 16:26; 1 Corinthians 15:3; 15:4; 2 Peter 3:16.
"Graphe" (Strong's # 1124) is used at 2 Peter 3:16 as "inspired scripture" and context itself indicates this meaning there. Paul's writings were compared to "other [inspired] scripture."
"As used in the Christian Greek Scriptures, the Greek word 'graphe' ('a writing') refers only to the sacred writings in God's Word the Bible." - Insight on the Scriptures, Vol. 2, p. 879.
It may be that Paul was referring to the scriptures available then (the OT), but we (and most others who call themselves Christians) now also include what is called the New Testament (NT) under the designation of "inspired scripture."
Therefore, since 2 Tim. 3:16 itself is "inspired scripture," it now should be considered (by Christians, at least) as part of the "all scripture" mentioned above.
Additionally, it may be that the inspired writings of the NT writers (including Paul's writings, of course) were considered inspired scripture even then.
Notice 2 Peter 3:16:
"[Paul,] speaking of this as he does in all his letters. There are some things in them hard to understand, which the ignorant and unstable twist to their own destruction, as they do THE OTHER SCRIPTURES." - NRSV.
The word for "scripture(s)" in the NT is 'graphe.' The inspired writers of the NT always used this word as meaning "inspired scriptures." Here are all the 51 places it is found in the NT:
"Scripture": Mark 12:10; 15:28; Luke 4:21; John 2:22; 7:38; 7:42; 10:35; 13:18; 17:12; 19:24; 19:28; 19:36; 19:37; 20:9; Acts 1:16; 8:32; 8:35; Romans 4:3; 9:17; 10:11; 11:2; Galatians 3:8; 3:22; 4:30; 1 Tim. 5:18; 2 Tim. 3:16; James 2:8; 2:23; 4:5; 1 Peter 2:6; 2 Peter 1:20.
"Scriptures": Matthew 21:42; 22:29; 26:54; 26:56; Mark 12:24; 14:49; Luke 24:27; 24:32; 24:45; John 5:39; Acts 17:2; 17:11; 18:24; 18:28; Romans 1:2; 15:4; 16:26; 1 Corinthians 15:3; 15:4; 2 Peter 3:16.
"Graphe" (Strong's # 1124) is used at 2 Peter 3:16 as "inspired scripture" and context itself indicates this meaning there. Paul's writings were compared to "other [inspired] scripture."
"As used in the Christian Greek Scriptures, the Greek word 'graphe' ('a writing') refers only to the sacred writings in God's Word the Bible." - Insight on the Scriptures, Vol. 2, p. 879.