5 “The remembrance of the abundance of Your sweetness they shall pour forth.” O happy feasts! What shall they eat, who thus shall “pour forth”!...So eat, that you may pour forth again; so receive, that you may give. Thou eatest, when you learn, you pour forth again, when you teach, you eat, when you hear, you pour forth again, when you preach, but that you pour forth, which you have first eaten. Finally, that most eager feaster John, to whom the very table of the Lord sufficed not, unless he leaned on the Lord's breast, and of his inmost heart drank in divine secrets; what did he pour forth? “In the beginning was the Word, and the Word was with God.” How is it that it suffices not to say, “Your remembrance;” or, “the remembrance of Your abundance”? Because, what avails it if it be abundant, yet not sweet? So also it is annoying if it be sweet but too little.
6....By “pouring forth” this, His preachers “shall exult in His righteousness” not in their own. What then have You done unto us, O Lord, whom we praise, that we should be, that we should praise, that we should “exult in Your righteousness,” that we should “utter forth the remembrance of the abundance of Your sweetness”? Let us tell it, and, as we tell, let us praise.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)