“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:”
King James Version (KJV)
2:13 God hath from the beginning - Of your hearing the gospel. Chosen you to salvation - Taken you out of the world, and placed you in the way to glory.
2Th 2:13 From the beginning. From the beginning God had determined on the salvation of the Gentiles, and arranged the plans by which they were saved. For a full discussion of the subject, see notes on Ro 9:1-33. Chosen you to salvation. In contrast with those who fall victims to the man of sin, the Thessalonian Christians had been chosen to life. Through sanctification of the Spirit. This clause tells how God chosen them to salvation. To this there are two sides, the human and the divine. On the human side they believed the truth. On the divine side, God sanctified them by the Spirit. He had chosen from the beginning all that believe and accept the truth.