14 “For if an enemy had upbraided me”. And indeed above he was “troubled in his exercise” by the voice of the enemy and by the tribulation of the sinner, perhaps being placed in that city, that proud city that was building a tower, which was “sunk,” that divided might be the tongues: give heed to his inward groaning because of perils from false brethren. “For if an enemy had upbraided me, I would have undergone it assuredly, and if he that did hate me had over me spoken great words,” that is, through pride had on me trampled, did magnify himself above me, did threaten me all in his power: “I would hide myself assuredly from him.”
From him that is abroad, you would hide yourself where? Amid those that are within. But now see whether anything else remains, but that thou seek solitude. “But you,” he says, “man of one mind, my guide and my friend”. Perchance sometimes good counsel you have given, perchance sometimes you have gone before me, and some wholesome advice you have given me: in the Church of God together we have been. “But you,...that together with me took sweet morsels”. What are the sweet morsels?
Not all they that are present know: but let them not be soured that do know, in order that they may be able to say to them that as yet know not: “Taste ye and see, how sweet is the Lord.” “In the House of God we have walked with consent.” Whence then dissension? Thou that wast within, hast become one without. He has walked with me in the House of God with consent: another house has he set up against the House of God. Wherefore has that been forsaken, wherein we have walked with consent? wherefore has that been deserted, wherein together we did take sweet morsels?
Source: The Enarrations, or Expositions, on the Psalms (New Advent)