"Pride does not perceive that it walks in darkness and, as being darkened, it does not know the insight of wisdom. For this reason in its own murky thoughts it elevates itself above all, whereas it is more vile and more feeble than any, and it is incapable of learning the ways of the Lord. And the Lord conceals His will from it, because it did not choose to walk in the path of the humble."
St. Isaac the Syrian - "Ascetical Homilies" (Homily Nineteen)