Only Begotten Son

For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. John 3:16
Jesus used this name for Himself in His long discussion with Nicodemus about the meaning of the new birth (see John 3:1-21). This verse from that discussion is probably the best known passage in the entire Bible. Most Christians can quote it from memory. It had been called “the gospel in a nutshell” because its twenty-five words tell us so clearly and simply why Jesus came into the world.
The name Only Begotten Son describes Jesus’ special relationship with the Father. He is unique-the one and only of His kind who has ever existed. The fact that He was God’s one and only Son makes His role as our Savior all the more significant. God the Father sent the very best when He sent Jesus to die on the cross for our sins. 
This name of Jesus appears only in the writings of the apostle John (see John 1:18; 3:18; 1 John 4:9). John in his Gospel also referred to Jesus as the Only Begotten of the Father (John 1:14).