The Pure In Heart

Adest ecce gradus sextus: Beati, inquit, mundo corde, quia ipsi Deum videbunt. Plane jam mundo sunt corde, plane jam Deum videre poterunt, qui pauperes spiritu, qui mites, qui lamentati peccata, qui justitia refecti, qui misericordes, in adversariis quoque tam sincerum oculum cordis, et lucidum gerunt, ut sine aliqua malitiae luppitduine inaccessibilem Dei claritatem sine impedimento conscpiciant. Munditia enim cordis, et conscientiae puritas nullam nubem ad intuendum Dominum patietur. Sanctus Chromatius Aquileiensis, Sermo De Octo Beatitudinibus

So we come to the sixth step: Blessed, He says, are the pure in heart because they shall see God. 1 Clearly they are already pure in heart who already clearly see God, who are poor in spirit, who are meek, who have mourned sins, who have been restored with righteousness, who are merciful, who have so healthy and clear an eye of the heart that even in adversities, without any sickness of wickedness, they are able to look on the inaccessible light of God. For the cleanness of the heart and the purity of the conscience suffers no cloud to obscure the sight of God.   Saint Chromatius of Aquileia, On the Eight Beatitudes   1 Mt 5.8