Augustine of Hippo

"Lord, my heart is not lifted up" [Psalm 131:1]. He hath offered a sacrifice. Whence do we prove that he hath offered a sacrifice? Because humility of heart is a sacrifice. ...If there is no sacrifice, there is no Priest. But if we have a High Priest in Heaven, who intercedeth with the Father for us (for He hath entered into the Holy of Holies, within the veil), ...we are safe, for we have a Priest; let us offer our sacrifice there. Let us consider what sacrifice we ought to offer; for God is not pleased with burnt-offerings, as ye have heard in the Psalm. But in that place he next showeth what he offereth: "The sacrifice of God is a troubled spirit: a broken and a contrite heart, O God, shall Thou not despise."

"Lord, my heart was not lifted up, neither were mine eyes raised on high" [Psalm 131:1]; "I have not exercised myself in great matters, nor in wonderful things which are too high for me" [Psalm 131:2]. Let this be more plainly spoken and heard. I have not been proud: I have not wished to be known among men as for wondrous powers; nor have I sought anything beyond my strength, whereby I might boast myself among the ignorant. As that Simon the sorcerer wished to advance into wonders above himself, on that account the power of the Apostles more pleased him, than the righteousness of Christians. ...What is above my strength, he saith, I have not sought; I have not stretched myself out there, I have not chosen to be magnified there. How deeply this self-exaltation in the abundance of graces is to be feared, that no man may pride himself in the gift of God, but may rather preserve humility, and may do what is written: "The greater thou art, the more humble thyself, and thou shall find favour before the Lord:" [Sirach 3:18] how deeply pride in God's gift should be feared, we must again and again impress upon you. ...