Assurance

James Anderson's answer for those who are troubled by whether they are among God's children:

All those, and only those, who come to saving faith have been redeemed by Christ. So the question of whether I have been redeemed by Christ reduces (like the question of whether I am elect) to the question of whether I have saving faith.
If I recognize that I am a sinner in need of a Savior, and that Christ is the only Savior of sinners, and I am looking to him alone for salvation, then I have every reason to believe that Christ died for me.