All of these Elect shall be preserved unto Eternal Glory, simply because they are God's very own Elect.. 1 Thess 5:23
And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ.
Who is Paul writing to here but those Chosen of God 2 Thess 2:13
13 But we are bound to give thanks alway to God for you, brethren beloved of the Lord, because God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth:
1 Thess 1:4
Knowing, brethren beloved, your election of God.
BTW, this statement indicates for sure that Paul preached Election to them in His Gospel, how else would he refer them back to that subject ? " Knowing your election of God ? The word knowing here is the greek word eido and means:
to see
to perceive with the eyes
to perceive by any of the senses
to perceive, notice, discern, discover
to see
They had discovered their Election of God, they perceived it. The word also is in the perfect tense in the greek, it was perceived in the past, a completed perception, once and for all, resulting into present perception, they will always know it !
They know it to be an act of the Father, He having Chosen them in Christ before the foundation of the world, this was Gospel Truth !
This also was can be understood as the Knowledge of the Apostle had of them being of God's Election by the way they received the word of God. They had received it as the Word of God and not of men.. 1 Thess 2:13
For this cause also thank we God without ceasing, because, when ye received the word of God which ye heard of us, ye received it not as the word of men, but as it is in truth, the word of God, which effectually worketh also in you that believe.
This is the same way the Elect Disciples received the word of God from Christ ! Jn 17:8
For I have given unto them the words which thou gavest me; and they have received them, and have known surely that I came out from thee, and they have believed that thou didst send me.
Thats an evidence of Election when one receives the words of God, His Gospel..