There are certain words or phrases that John frequently uses that show the repeating themes of his Gospel: believe, witness, Comforter, life - death, light - darkness, I am... (as in Jesus is the "I Am"), and love.
May mga tiyak na salita at pangungusap na ginagamit si Juan upang ipakita ng paulit ulit ang tema ng kanyang ebanghelyo gaya ng: manampalataya, nagpapatotoo, Mangaaliw, buhay - kamatayan, liwanag - kadiliman, Ako nga (marami sa sinabi ni Hesus na "Ako nga"), at pag-ibig.