It is not the being seen of men that is wrong, but doing these things for the purpose of being seen of men. The problem with the hypocrite is his motivation. He does not want to be holy; he only wants to seem to be holy. He is more concerned with his reputation for righteousness than about actually becoming righteous. The approbation of men matters more to him than the approval of God.
Saint AugustineThe Church even now is the kingdom of Christ and the kingdom of heaven. Accordingly, even now His saints reign with Him, though otherwise than as they shall reign hereafter; and yet, though the tares grow in the Church along with the wheat, they do not reign with Him. For they reign with Him who do what the apostle says, 'If you are risen with Christ, mind the things which are above, where Christ sits at the right hand of God. Seek those things which are above, not the things which are on the earth'.
Saint AugustineHe loves Thee too little, who loves anything together with Thee, which he loves not for Thy sake.
Saint AugustineHope has two beautiful daughters; their names are Anger and Courage. Anger at the way things are, and Courage to see that they do not remain as they are.
Saint AugustineWonderful is the depth of thy words, whose surface is before us, gently leading on the little ones: and yet a wonderful deepness, O my God, a wonderful deepness. It is awe to look into it; even an awfulness of honour, and a trembling of love.
Saint AugustineAlthough among heretics and schismatics there is the same Baptism, nevertheless, the remission of sins is not operative among them because of the very rottenness of discord and wickedness of dissension ... Baptism was in them, but it did not profit them outside the Church ... Outside the Church, Baptism works death because of discord.
Saint Augustine