Gregory the Great
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.
(23. Mor. c. 6.) There are different shapes in which the pride of self-confident men presents itself; when they imagine that either the good in them is of themselves; or when believing it is given them from above, that they have received it for their own merits; or at any rate when they boast that they have that which they have not. Or lastly, when despising others they aim at appearing singular in the possession of that which they have. And in this respect the Pharisee awards to himself especially the merit of good works.