Lord Knows We Could Use One!
First, The Negatives:
Be not quickly shaken...nor disturbed...nor deceived.
...you be not quickly shaken [saleu,w] from your composure or be disturbed [evxapata,w] either by a spirit or a message or a letter as if from us, to the effect that the day of the Lord has come. Let no one in any way deceive [evxapata,w] you, for it will not come unless the apostasy comes (2Th 2:2-3).
Friberg Lexicon:
saleu,w
(1) literally, as the unexpected and disastrous shaking of what would be thought to be stable, e.g. earth or sky shake, cause to move to and fro, cause to waver or totter, make to rock (AC 16.26); (2) figuratively; (a) of stirring up a crowd incite, move, agitate (AC 17.13); (b) mentally, of an individual agitate; passive be distressed, be upset, be shaken (2TH 2.2)
evxapata,w;
deceive completely, entice, delude
The Positive Counterpart:
Stand firm...hold to the traditions:
So then, brethren, stand firm [sth,kw] and hold [krate,w] to the traditions which you were taught, whether by word of mouth or by letter from us (2Th 2:15).
Friberg Lexicon:
sth,kw
(1) literally stand (MK 11.25); (2) figuratively; (a) as demonstrating stability stand firm, be steadfast (1C 16.13); (b) as gaining approval when examined stand (RO 14.4), opposite pi,ptw (fall)
krate,w
(1) take hold of (forcibly), seize, grasp (MT 9.25); (2) take into custody, seize, arrest (MT 14.3); (3) take control of, hold (fast) (AC 2.24); (4) hold back, restrain from, hinder, prevent (LU 24.16); (5) of following a doctrine, creedal confession, or course of life hold fast to, keep hold of, continue firmly in (HE 4.14); of causing a state to continue retain, keep (JN 20.23)
Recap:
Do not be quickly shakenmeaning dont become unglued so that your faith fails you and you are deceived. On the other hand, stand firm, and hold to the traditions you were taught.
The text:
Let no one in any way deceive you, for [kata,] it will not come unless the apostasy comes (2Th 2:3).
Friberg Lexicon:
kata, with the accusative: to indicate goal or purpose for the purpose of, to, for (JN 2.6);
Example:
there were six stone waterpots set there for [the reason of] the Jewish custom of purification (Jo 2:6).
Same grammatical feature:
Let no one in any way deceive you, for [the reason that] it will not come unless the apostasy comes (2Th 2:3).
Meaning:
Do not be shaken or thrown into a quandryfor the reason that it may not come unless the apostasy.
What is the it which may not come? It is the coming of our Lord and our gathering together to him (2Th 2:2). And what hinders that? It is our not being shaken or deceived (2Th 2:2); positively, it is our firm stand, our steadfastness in the received traditions.
...do not be quickly shaken [saleu,w] from your composure or be disturbed [evxapata,w] ...that the day of the Lord has come. Let no one in any way deceive [evxapata,w] you, for it [the day of the Lord] will not come unless the apostasy comes (2Th 2:2-3).
In context, apostasy refers to being shaken and deceived.
Let no one in any way deceive you (2Th 2:3).
with all the deception of wickedness (2Th 2:10).
For this reason God will send upon them a deluding influence so that they will believe what is false, in order that they all may be judged who did not believe the truth, but took pleasure in wickedness (2 Th 2:11-12).
be not quickly shaken from your composure or be disturbed either by a spirit or a message or a letter as if from us (2Th 2:2).
So then, brethren, stand firm and hold to the traditions which you were taught, whether by word of mouth or by letter from us. Now may our Lord Jesus Christ Himself and God our Father, who has loved us and given us eternal comfort and good hope by grace, comfort and strengthen your hearts in every good work and word (2Th 2:15-17).