6 And let not the worshipper, beloved brethren, be ignorant in what manner the publican prayed with the Pharisee in the temple. Not with eyes lifted up boldly to heaven, nor with hands proudly raised; but beating his breast, and testifying to the sins shut up within, he implored the help of the divine mercy. And while the Pharisee was pleased with himself, this man who thus asked, the rather deserved to be sanctified, since he placed the hope of salvation not in the confidence of his innocence, because there is none who is innocent; but confessing his sinfulness he humbly prayed, and He who pardons the humble heard the petitioner.
And these things the Lord records in His Gospel, saying, “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 You that I am not as other men are, unjust, extortioners, adulterers, even as this publican. I fast twice in the week, I give tithes of all that I possess. But the publican stood afar off, and would not so much as lift up his eyes unto heaven, but smote upon his breast, saying, God, be merciful to me a sinner. I say unto you, this man went down to his house justified rather than the Pharisee: for every one that exalts himself shall be abased; and whosoever humbles himself shall be exalted.”
Source: The Treatises of Cyprian (New Advent)