John’s gospel primarily focuses on the divinity of Christ. We call this today Christology or the study of Christ. Every story in John’s gospel is aimed at revealing to people that truly Jesus was the Son of God, the Messiah. This account we read about today can only be found in the gospel of John because it so heavily looks forward to an act only capable by divinity, the resurrection.
“Very truly, I tell you, unless a grain of wheat falls into the earth and dies, it remains just a single grain; but if it dies, it bears much fruit.” (John 12:24)
Not only do we see Jesus put life itself on the relevance scale against a grain of wheat, but he also stresses the importance of its death. Just like Jesus will fall and die, his resurrection will bring about much fruit; the establishment of the Church and the forgiveness of all of our sins.
So we must die of this world in order to bear fruits that make us worthy and ready to enter into the heavenly kingdom of God the Father.