“I, therefore, the prisoner of the Lord, entreat you to walk in a manner worthy of the calling with which you have been called.” - Ephesians 4:1
"We didn’t choose God; He chose us.
What is “the calling with which [we] have been called”? It is simply the position we have now as Christians. Paul said the Christians at Corinth were “saints by calling” (1 Cor. 1:2). Peter instructed his readers to make certain about God’s calling and choosing them (2 Peter 1:10). Our calling is a high calling (Phil. 3:14), “a holy calling” (2 Tim. 1:9), and “a heavenly calling” (Heb. 3:1). Who called us? Jesus has the answer: “No one can come to Me, unless the Father who sent Me draws him” (John 6:44). Jesus also said, “You did not choose Me, but I chose you” (15:16). Those “whom [God] predestined, these He also called; and whom He called, these He also justified; and whom He justified, these He also glorified” (Rom. 8:30). God called out to us, we responded in faith, and He saved us.
Suppose after investigating all the different religions of the world, a person chose Christianity. If Christianity were nothing more than a simple, personal choice to be saved, this person would have a certain level of commitment—that is, “Since I’ve decided to do it, it’s worth doing.” But if I’m a Christian because before the world began, the sovereign God of the universe chose me to spend eternity in His presence, that creates a much greater level of commitment.
If a single woman approached a bachelor, told him he had characteristics she admired, and asked him if he would be interested in marrying her, there would be something missing in that courtship. But suppose he approaches this woman first and says, “I have gone from one end of the world to the other, and your character and beauty surpass all others. Will you marry me?” We know then that nothing is missing.
Magnify that illustration by considering God’s perspective. We didn’t ask God if we could get in on a salvation deal. Out of all the people in the world, He chose us to receive His mercy! That’s a high, holy, heavenly calling. Such a calling demands a response of commitment, doesn’t it?" - John MacArthur