It is important to observe that “Son of God” when it is applied to Jesus means something quite different from “sons of God” elsewhere in Scripture (e.g., Job 1:6; Mat. 5:9; Rom. 8:14). So how is Jesus’ identity as the Son of God unique?
Our Lord refers to himself as the Son
“No one knows the Father except the Son and anyone to whom the Son chooses to reveal him” (Mat. 11:27).
The Scriptures refer to Jesus as the only Son
“For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life” (John 3:16).
There is a great difference between the sonship of Jesus, who has always been the Son of God by nature, and the way in which we become the children of God through adoption by grace: “To all who did receive him … he gave the right to become children of God” (John 1:12).