Passage
and stedfast is the Lord, who shall establish you, and shall guard <FI>you<Fi> from the evil;
and stedfast is the Lord, who shall establish you, and shall guard <FI>you<Fi> from the evil;
2 Thessalonians 3:1 As to the rest, pray ye, brethren, concerning us, that the word of the Lord may run and may be glorified, as also with you,
2 Thessalonians 3:2 and that we may be delivered from the unreasonable and evil men, for the faith <FI>is<Fi> not of all;
2 Thessalonians 3:3 and stedfast is the Lord, who shall establish you, and shall guard <FI>you<Fi> from the evil;
2 Thessalonians 3:4 and we have confidence in the Lord touching you, that the things that we command you ye both do and will do;
2 Thessalonians 3:5 and the Lord direct your hearts to the love of God, and to the endurance of the Christ.
The verse centers on "stedfast", "lord", "shall", "establish", "guard", and "evil". It is saying that the verse draws attention to "stedfast" and "lord", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 2's "and that we may be delivered from..." into verse 4's "and we have confidence in the Lord...", so "stedfast" and "lord" belong inside that flow. In 2 Thessalonians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "stedfast" and "lord" with trust shaped by these words, not by a vague optimism outside the passage.