14 “And Jesus said unto them, I am the Bread of Life: he that comes to me shall never hunger; and he that believes in me shall never thirst.” “He that comes to me;” this is the same thing as “He that believes in me;” and “shall never hunger” is to be understood to mean the same thing as “shall never thirst.” For by both is signified that eternal sufficiency in which there is no want. You desire bread from heaven; you have it before you, and yet you do not eat. “But I said unto you, that you also have seen me, and you believed not.” But I have not on that account lost my people. “For has your unbelief made the faith of God of none effect?” For, see what follows: “All that the Father gives me shall come to me; and him that comes to me, I will not cast out of doors.” What kind of within is that, whence there is no going out of doors? Noble interior, sweet retreat! O secret dwelling without weariness, without the bitterness of evil thoughts, without the solicitings of temptations and the interruptions of griefs! Is it not that secret dwelling whither shall enter that well-deserving servant, to whom the Lord will say, “Enter into the joy of your Lord?”
Source: Tractates on the Gospel of John (New Advent)