Word

John 1:1
1 In the beginning was the Word, and the Word was with God, and the Word was God.

Words reflect the heart. Out of the heart we are revealed.
That is why John calls Jesus the word of God. God revealed His heart in His Son. Jesus said He only spoke the words of His Father and is described as the exact image of God.
He reveals the Son in our hearts, like a seed sown in the earth. It is there Father and Son come to abide. We then begin to become more like Him as our heart changes in that fellowship, as we abide in that word, and it in  us.
The Word is the heart of God.
Lay your head on His breast and listen to the heartbeat of life.