What does the Bible say about who are the children of God?

The Bible distinguishes between two types of children: those of God and those of the devil. According to Hebrews 2:14-18, the children are partakers of flesh and blood, and they are specifically referred to as the elect of God. Ephesians 1:4 emphasizes that these children were chosen in Christ before the foundation of the world. It reveals that the children of God are not just any believers but rather those who have been sanctified and united with Christ, the ones whom He considers His brethren.