John Chrysostom — as excerpted in the Catena Aurea on John 4:13-18

“(Hom. xxxii. 1) The excellence of this water, viz. that he that drinketh of it never thirsts, He explains in what follows, But the water that I shall give him shall be in him a well of water springing up into everlasting life. As a man who had a spring within him, would never feel thirst, so will not he who has this water which I shall give him.”