The Catechism in Questions & Answers

259. What is the result of accepting this election?

God elects human beings for their own salvation as well as the salvation of others. Whenever God elects anyone, there is a certain task or responsibility associated with it. Acceptance of one’s election in faith means following Jesus Christ, the author of salvation, conscientiously. This involves arranging one’s life in accordance with the gospel. This attracts the blessing of God.
Election also has effects for the future: when Jesus Christ establishes His kingdom of peace, the royal priesthood will proclaim the glad tidings of salvation in Christ to all human beings. Those who partake in the first resurrection are elected to this task.

Salvation: see Questions 243. et seq. Royal priesthood: see Question 577. First resurrection: see Questions 574., 575.