13 Thus as he was here speaking of charity, he adds, “For my brethren and companions' sake, I spoke peace of you”. O Jerusalem, thou city whose partaking is in The Same, I in this life and on this earth, I poor, he says, I a stranger and groaning, not as yet enjoying to the full your peace, and preaching your peace; preach it not for my own sake, as the heretics, who seeking their own glory, say, Peace be with you: and have not the peace which they preach to the people. For if they had peace, they would not tear asunder unity. “I,” he says, “spoke peace of you.” But wherefore? “For my brethren and companions' sake:” not for my own honour, not for my own money, not for my life; for, “To me to live is Christ, and to die is gain.” But, “I spoke peace of you, for my brethren and companions' sakes.” For he wished to depart, and to be with Christ: but, since he must preach these things to his companions and his brethren, to abide in the flesh, he adds, is more needful for you.
14. “Because of the house of the Lord my God, I have sought good things for you”. Not on my own account have sought good things, for then I should not seek for you, but for myself; and so should I not have them, because I should not seek them for you; but, “Because of the house of the Lord my God,” because of the Church, because of the Saints, because of the pilgrims; because of the poor, that they may go up; because we say to them, we will go into the house of the Lord: because of the house of the Lord my God itself, I have sought good things for You. These long and needful words gather ye, brethren, eat them, drink them, and grow strong, run, and seize.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)