Theophylact of Ohrid
Catena Aurea · Lukasevangelium 18
And he spake this parable unto certain which trusted in themselves that they were righteous, and despised others: Two men went up into the temple to pray; the one a Pharisee, and the other a Publican. The Pharisee stood and prayed thus with himself, God, I thank thee, that I am not as other men are, extortioners, unjust, adulterers, or even as this Publican. I fast twice in the week, I give tithes of all that I possess. And the Publican, standing afar off, would not lift up so much as his eyes unto heaven, but smote upon his breast, saying, God be merciful to me a sinner. I tell you, this man went down to his house justified rather than the other: for every one that exalteth himself shall be abased; and he that humbleth himself shall be exalted.
Pride also beyond all other passions disturbs the mind of man. And hence the very frequent warnings against it. It is moreover a contempt of God; for when a man ascribes the good he doth to himself and not to God, what else is this but to deny God? For the sake then of those that so trust in themselves, that they will not ascribe the whole to God, and therefore despise others, He puts forth a parable, to shew that righteousness, although it may bring man up to God, yet if he is clothed with pride, casts him down to hell.