Catena Aurea on John 7:37–39: Augustine of Hippo

The belly of the inner man, is the heart’s conscience. Let him drink from that water, and his conscience is quickened and purified; he drinks in the whole fountain, nay, becomes the very fountain itself. But what is that fountain, and what is that river, which flows from the belly of the inner man? The love of his neighbour. If any one, who drinks of the water, thinks that it is meant to satisfy himself alone, out of his belly there doth not flow living water. But if he does good to his neighbour, the stream is not dried up, but flows.