The word for “chosen” in the Greek language is eklektos, meaning “chosen out, select.” It can also be translated as “elect” (Vine’s Expository Dictionary of Old and New Testament Words, “Choice, Choose, Chosen”). God truly calls and He chooses, but after one’s calling, an individual decision has to be made as well. One must choose God back and begin to live faithfully.
“But we are bound to give thanks to God always for you, brethren beloved by the Lord, because God from the beginning chose you for salvation through sanctification by the Spirit and belief in the truth, to which He called you by our gospel, for the obtaining of the glory of our Lord Jesus Christ. Therefore, brethren, stand fast and hold the traditions you were taught, whether by word or our epistle” (2 Thessalonians 2:13-15).
The apostle Paul clearly states the combined decision by God to both call and choose His people, but Christians are to hold fast to what they were taught from God’s apostolic leaders by the Word of God and the Holy Spirit. They had to become and remain obedient to God and to live faithfully doing all that God would ask of them.
This is further explained in Ephesians 1:13: “In Him you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed you were sealed with the Holy Spirit of promise” (emphasis added throughout).
We have to make a decision after we hear the word of truth and the calling from God. We must trust God and believe in His Son, and then be sealed with the Holy Spirit. One should believe in their heart, repent (make a 180 degree turn from sin towards God), confess with their mouth before men that they have believed upon Jesus as Lord and be water baptized. One is water baptized by immersion in the name of the Father, the Son and the Holy Spirit and is sealed with the Holy Spirit.
We all are to be obedient to God. We cannot just accept the wonderful calling of God and continue to live a life following our own desires. We are to be the “elect according to the foreknowledge of God the Father, in sanctification of the Spirit, for obedience and sprinkling of the blood of Jesus Christ” (1 Peter 1:2).
The called and chosen must be also live faithfully! They must continue to actively believe, obey and rely on God. The called and chosen will need to faithfully endure, both in good and in bad times.Paul very clearly stated the responsibilities of the called: “Therefore, as the elect of God, holy and beloved, put on tender mercies, kindness, humility, meekness, longsuffering; bearing with one another, and forgiving one another, if anyone has a complaint against another; even as Christ forgave you, so you also must do. But above all these things put on love, which is the bond of perfection. And let the peace of God rule in your hearts, to which also you were called in one body; and be thankful” (Colossians 3:12-15).