9 See how he willed that kings should sing on their way, humbly bearing the Lord, not lifting themselves up against the Lord. For if they lift themselves up, what follows? “For the Lord is high, and has respect unto the lowly”. Do kings then desire that He have respect unto them? Let them be humble. What then? If they lift themselves up to pride, can they escape His eyes? Lest perchance, because you have heard, “He has respect unto the lowly,” thou choose to be proud, and say in your soul, God has respect unto the lowly, He has not respect unto me, I will do what I will.
O foolish one! Would you say this, if you knew what you ought to love? Behold, even if God wills not to see you, do you not fear this very thing, that He wills not to see you?...The lofty then, it seems, He has not respect unto, for it is the lowly He respects. “The lofty”— what? “He considers from afar.” What then gains the proud? To be seen from afar, not to escape being seen. And think not that you must needs be safe on that account, for that He sees less clearly, who sees you from afar.
For thou indeed see not clearly, what you see from afar; God, although He see you from afar, sees you perfectly, yet is He not with you. This you gain, not that you are less perfectly seen, but that you are not with Him by whom you are seen. But what does the lowly gain? “The Lord is near unto them that are of a contrite heart.” Let the proud then lift himself up as much as he will, certainly God dwells on high, God is in heaven: do you wish that He come near to you? Humble yourself. For the higher will He be above you, the more you lift yourself up.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)