Verse

John 12:39

A church father on this verse
(Hom. lxviii. 2) This is a common form of speech among ourselves. I cannot love such a man, meaning by this necessity only a vehement will. The Evangelist says could not, to show that it was impossible that the Prophet should lie, not that it was impossible that they should believe.
John Chrysostom, 5th c. — Catena Aurea by Aquinas
Original

39Therefore they could not believe, because that Esaias said again,

Modern

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In context

37But though he had done so many miracles before them, yet they believed not on him:

38That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed?

John 12:39

40He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.

41These things said Esaias, when he saw his glory, and spake of him.

Read all of John 12