
Ambrose of Milan
Catena Aurea · Matthäusevangelium 5
Blessed are the pure in heart: for they shall see God.
(in Luc. vi. 22.) The merciful loses the benefit of his mercy, unless he shews it from a pure heart; for if he seeks to have whereof to boast, he loses the fruit of his deeds; the next that follows therefore is, Blessed are the pure in heart.