“Through him all things were made; without him nothing was made that has been made” is about as total a claim as language allows — not most things, not the important things, but everything that exists, without exception. Then the text narrows suddenly, from cosmic scope to something intimate: “in him was life, and that life was the light of all mankind.” This is the same point John makes across his whole Gospel: the one through whom galaxies were made is the same Jesus his readers would go on to see hungry, exhausted, weeping at a friend's grave. The cosmic architect and the specific man asking for water at a well are one and the same subject, not two different figures loosely associated.